Explainers

NHS Grievance Procedure Explained

FP FrontlinePay Editorial

Updated September 2026

Independent guidance — not affiliated with NHS England or DHSC

Short answer

A workplace grievance is a formal complaint you raise about something affecting you at work — your treatment, a decision, a colleague's conduct towards you — and NHS trusts, like all UK employers, generally handle it through a process built around the ACAS Code of Practice on Disciplinary and Grievance Procedures: an attempt at informal resolution where realistic, then a formal written grievance, an investigation, a formal hearing you're entitled to be accompanied at, a written outcome, and a right of appeal. It's a genuinely different process from both whistleblowing (which protects you for raising a public-interest concern, not your own personal treatment) and a disciplinary process (where your employer, not you, raises the concern). This page walks through the general shape of that process, your rights at each stage, and where it sits alongside those two related — but distinct — processes.

Deciding to raise a formal grievance is rarely a step people take lightly — it usually follows something that's already been bothering you for a while, and it can feel like it risks making a difficult situation worse before it gets better. Understanding the shape of the process in advance, what you're actually entitled to at each stage, and how it differs from other processes you might have heard about (whistleblowing, disciplinary action) tends to make it feel more like something you can navigate deliberately, rather than a leap into the unknown.

Informal resolution: often the expected first step

The ACAS Code of Practice on Disciplinary and Grievance Procedures — a statutory code every UK employer, including every NHS trust, must have regard to — generally expects informal routes to be tried first, wherever that's realistic. For a lot of workplace friction, simply raising the issue directly with the person concerned, or with your immediate manager, resolves it without needing a formal process at all: a misunderstanding gets cleared up, a working pattern gets adjusted, an apology is given and accepted.

Informal resolution isn't always the right starting point, though, and no genuine grievance policy requires you to attempt it in every situation. It's reasonable to go straight to a formal written grievance where the concern involves your own manager (who you'd otherwise be expected to raise it with informally), where you've already tried raising it informally and nothing changed, or where the matter is serious enough — bullying, harassment, discrimination — that you don't feel an informal conversation is appropriate or safe. Choosing to formalise a grievance without an informal attempt first is a legitimate choice, not something that counts against you. If it is bullying or harassment, our guide to raising bullying and harassment and keeping evidence includes a printable diary.

The formal grievance process, step by step

Procedural detail varies between trusts, but most NHS grievance policies broadly follow a similar overall sequence, built around the ACAS framework:

You raise a formal grievance in writing

Setting out what happened, when, who was involved, and what outcome you're seeking, addressed to a manager who isn't the subject of the grievance — usually someone more senior, or from a different part of the organisation if the grievance concerns your own manager.

Acknowledgement

Your trust should acknowledge receipt promptly, and confirm who will be handling the grievance and the general timeline you can expect.

Investigation

An appointed manager or investigating officer gathers relevant evidence — documents, records, and usually statements from you and any witnesses — before the matter goes to a formal hearing.

A formal grievance hearing

A manager not previously involved hears your case, with you entitled to be accompanied and to explain your grievance and respond to the evidence gathered during the investigation.

A written outcome

You should receive a written decision setting out what was found and, where the grievance is upheld in whole or part, what action the trust intends to take to resolve it.

A right of appeal

If you're not satisfied with the outcome, most policies let you appeal, usually within a short, fixed window, to someone more senior than the original decision-maker.

How long this takes in practice varies with the complexity of what's being investigated — the ACAS Code expects each stage to happen "without unreasonable delay," a general standard rather than a fixed deadline, and a grievance involving multiple witnesses or overlapping issues can reasonably run longer than a straightforward one.

Your right to be accompanied

UK law gives every worker a genuine statutory right — under the Employment Relations Act 1999 — to be accompanied at a formal grievance (or disciplinary) hearing by either a trade union representative or a work colleague of their choosing. This is a legal entitlement, not something granted at a manager's discretion, and a reasonable request to exercise it should be granted.

Your companion can generally address the hearing to put and sum up your case, respond on your behalf to points raised, and confer with you privately during it. What they generally can't do is answer questions put directly to you, or take over the hearing entirely. A trade union representative, particularly one experienced in workplace representation, often brings real value in the preparation before the hearing as well as during it — helping you set the grievance out clearly, gathering supporting evidence, and thinking through how the process is likely to unfold. See our guide to NHS staff representation for which bodies can formally represent you at a hearing, and which offer professional rather than industrial support.

Realistic timelines

There's no single fixed statutory timetable for a grievance from start to finish, but many trust policies set indicative internal targets to keep things moving — commonly acknowledging a formal grievance within about five working days, and aiming to hold a hearing within a few weeks of that. A straightforward, single-issue grievance might realistically resolve within four to six weeks in total; a more complex one — multiple witnesses, historic events, or a grievance that overlaps with a live disciplinary matter — can reasonably take considerably longer. If your grievance seems to be moving much more slowly than your trust's own policy anticipates, with no clear explanation, that's a reasonable thing to chase directly in writing.

ℹGrievances that overlap with a disciplinary process

Where a grievance and a disciplinary matter are closely connected — for example, you raise a grievance about a manager who is also involved in a live disciplinary process concerning you — trusts don't always have to run the two strictly one after the other. Many policies allow closely related grievance and disciplinary matters to be considered together, or by the same senior manager, provided this is handled transparently and fairly to everyone involved. If you're facing both at once, ask HR or your union representative to explain specifically how your trust intends to handle the overlap.

Grievance vs whistleblowing: which one is this?

These are related but genuinely different routes, and it's worth being clear on which one actually describes your situation before you raise anything formally.

Grievance

Fundamentally about your own treatment — how you personally have been dealt with over pay, workload, a working relationship, or a decision affecting you specifically.

Whistleblowing (protected disclosure)

About wrongdoing that matters beyond your own individual treatment — most often, in the NHS, a risk to patient safety — raised because you reasonably believe it's in the public interest, not primarily because of its effect on you.

The two aren't mutually exclusive — it's entirely possible for one set of events to involve both a personal grievance and a public-interest concern, and in practice they're sometimes raised together. The reason the distinction matters practically is that whistleblowing engages specific legal protections against dismissal and detriment that exist regardless of your trust's own internal policies, whereas a grievance is handled entirely under your trust's internal grievance policy. See our dedicated NHS Whistleblowing Rights guide for how that separate protection actually works, and talk to your union rep, HR, or the whistleblowing charity Protect if you're not sure which route actually fits your situation.

Grievance vs disciplinary process: opposite directions

A disciplinary process and a grievance run in opposite directions, even though they share some procedural DNA (both, for example, carry the same statutory right to be accompanied, and both are built around the same ACAS Code).

Grievance (this page)

You raise a formal complaint about something affecting you at work — your employer is responding to a concern you've brought.

Disciplinary process

Your employer raises a concern about you — your conduct or capability. See our dedicated NHS Disciplinary and Misconduct Process guide for how that separate process works.

The two can become genuinely tangled in practice — most commonly where someone raises a grievance about a manager shortly before, or during, a disciplinary process that manager is involved in running. Trusts generally maintain separate policies for each, and it's worth being clear with HR or your union representative about which process you're actually in if you're ever unsure, rather than assuming they'll automatically be treated as the same thing. If you are the one facing a disciplinary process, our NHS Disciplinary Hearing Pack helps you prepare.

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If a disciplinary process has already ended in dismissal, see Dismissed from the NHS: What Happens Next and our free dismissal deadline calculator.

Appeals and getting it right

Almost every NHS grievance policy provides a route to appeal a formal outcome you're not satisfied with, typically within a set number of days of receiving the written decision, to someone more senior than the original decision-maker. An appeal generally isn't a full re-run of the original grievance from scratch; it usually focuses on whether the process was followed fairly and whether the outcome reached was reasonable given the evidence available. If you're considering an appeal, your union representative can advise on whether there are reasonable grounds and help you draft it — appeal windows are often short, so this is another reason not to delay getting advice.

✓Why you can rely on this page

✓ Built around the ACAS Code of Practice on Disciplinary and Grievance Procedures — the statutory framework every UK employer, including every NHS trust, must have regard to.
✓ Deliberately describes the general, common shape of NHS trust grievance policies rather than inventing precise timescales that vary trust by trust — your own trust's policy always takes precedence.
✓ Clearly distinguishes a grievance from both whistleblowing and disciplinary action, cross-checked against our dedicated guides to each, rather than treating all three as the same kind of workplace process.
✓ Written to flag, repeatedly and clearly, when the right next step is your union representative or specific advice, not this page.
✓ Reviewed as ACAS guidance or common NHS employment practice changes, last checked September 2026.

Related guides

NHS Disciplinary & Misconduct Process

The reverse process — where your employer, not you, raises a concern.

NHS Whistleblowing Rights

Your legal protections for raising a public-interest concern, as distinct from a personal grievance.

NHS Staff Representation Explained

Which unions and Royal Colleges can actually represent you at a grievance hearing.

NHS Probation Period Explained

How concerns during probation are handled differently from both grievance and disciplinary processes.

NHS Notice Periods & Second Jobs Explained

Useful background on your contractual position if a grievance is connected to leaving your role.

Dismissed from the NHS: What Happens Next

What to check if a grievance or disciplinary process ultimately ends in dismissal.

NHS Bullying Complaint: Free Check and Pack

Free readiness check and routes guide (Handbook section 32), then incident log, formal complaint, evidence index, meeting prep, rep briefing and escalation letters.

Frequently asked questions

Do I have to try to sort things out informally before raising a formal grievance? +

Not as a strict legal requirement, but it's what the ACAS Code of Practice expects wherever it's realistic, and most NHS trust grievance policies build it in as the expected first step. If the issue is something small, recent, and involves someone you can still reasonably talk to directly, raising it informally first is usually quicker and can resolve things without the process becoming adversarial. That said, informal resolution isn't always appropriate — if the concern involves your own manager, if you've already tried raising it informally and nothing changed, or if the matter is serious enough that you don't feel comfortable raising it informally, going straight to a formal written grievance is a legitimate choice, not something you need to justify or apologise for.

How long does the whole grievance process usually take? +

There's no single fixed statutory timeline — the ACAS Code expects each stage to happen 'without unreasonable delay,' which is a standard, not a fixed clock. As a general guide, many trust policies aim to acknowledge a formal grievance within about five working days, hold a grievance hearing within two to four weeks of that, and issue a written outcome shortly afterwards — but a grievance involving multiple witnesses, complex facts, or overlapping issues (for example, alongside a live disciplinary matter) can reasonably take considerably longer. If your grievance seems to be stalling well beyond what your trust's own policy anticipates, that's worth raising directly, in writing, with HR or your union representative.

Can I bring my union representative to a grievance hearing? +

Yes. UK law gives every worker a statutory right, under the Employment Relations Act 1999, to be accompanied at a formal grievance hearing by a trade union representative or a work colleague of their choosing — this is the same right that applies to disciplinary hearings. Your companion can generally address the hearing, put and sum up your case, and confer with you during it, though they generally can't answer questions put directly to you. A reasonable request to be accompanied should be granted; it isn't something a manager can simply refuse.

What's the difference between a grievance and whistleblowing? +

They're aimed at fundamentally different things, even though the same underlying events can sometimes touch both. A grievance is about your own treatment — how you personally have been dealt with over pay, workload, a working relationship, bullying directed at you, or a decision affecting you specifically. Whistleblowing (a protected disclosure) is about wrongdoing that matters beyond your own individual treatment — most often, in the NHS, a risk to patient safety — raised because you reasonably believe it's in the public interest, not primarily because of how it affects you. See our dedicated NHS Whistleblowing Rights guide for the legal protections that specifically apply to a protected disclosure, which a personal grievance doesn't automatically carry.

What's the difference between a grievance and a disciplinary process? +

They run in opposite directions. A disciplinary process is your employer raising a concern about you — your conduct or capability. A grievance is the reverse: a formal complaint you raise about something at work. The two can become tangled in practice — for example, raising a grievance about a manager shortly before or during a disciplinary process they're involved in — and trusts generally run separate policies for each, though a closely related grievance and disciplinary matter are sometimes handled alongside each other rather than strictly one after the other. See our NHS Disciplinary and Misconduct Process guide for how that separate process works.

Can I raise a grievance about my manager, if they're the person who'd normally deal with it? +

Yes — every reasonable NHS grievance policy accounts for this and routes the grievance to someone more senior, or from a different part of the organisation, rather than to the person the complaint is actually about. If you're not sure who that should be in your own situation, HR or your union representative can point you to the right contact; you shouldn't have to raise a grievance about your manager directly to that same manager.

What if I'm not happy with the outcome of my grievance? +

Almost every NHS grievance policy provides a right of appeal, usually within a short, fixed window after you receive the written outcome — treat this as time-sensitive, since appeal windows are often measured in days. An appeal is typically heard by someone more senior than the original decision-maker, and generally examines whether the process was followed fairly and whether the outcome was reasonable given the evidence, rather than being a complete re-run of the original grievance from scratch.

Can raising a grievance affect how I'm treated at work afterwards? +

It shouldn't, and if it does, that's a serious problem in its own right, separate from your original grievance. Being treated worse specifically because you raised a genuine grievance in good faith is not something a well-run trust should tolerate, and depending on the facts, it could itself become a further grievance, or in some circumstances raise separate legal issues. That said, it's honest to acknowledge that raising a grievance, particularly against a manager you continue to work with day to day, can be genuinely uncomfortable in practice even where nothing improper happens — which is exactly the kind of situation where union support and, where relevant, a request to adjust reporting lines during the process are worth raising explicitly.

Does my union representative actually attend the grievance hearing with me, or just help me prepare? +

Both, generally. A trade union representative's statutory role at the hearing itself is broader than a work colleague's — they can typically address the hearing to put and sum up your case, respond to points raised, and confer with you during it. Just as importantly, though, a lot of their real value tends to come from preparation beforehand: helping you set out the grievance clearly in writing, gathering relevant evidence, and thinking through how the hearing is likely to go, not just showing up on the day.

Is there a time limit on raising a grievance about something that happened a while ago? +

There's no single fixed statutory deadline for raising an internal workplace grievance itself, but most trust policies expect a grievance to be raised 'without unreasonable delay' after the events concerned, and a long, unexplained gap can make it harder to investigate fairly (witnesses' memories fade, records may no longer exist) and can itself become a point raised against you during the process. If you're considering raising something that happened some time ago, it's still worth doing rather than assuming it's now too late — but raise it as soon as you reasonably can, and be ready to explain the gap if asked. Note this is separate from the strict, much shorter time limits that apply if a situation could instead lead to an employment tribunal claim, where getting early advice matters considerably more.

This page is general information about how NHS trust grievance processes typically work, as FrontlinePay understands the ACAS framework and common trust practice, correct to the best of our knowledge as of September 2026. It is not legal, HR, or employment advice and should not be relied on as a substitute for your own trust's grievance policy, advice from your trade union representative, or specific legal advice. FrontlinePay is an independent site and is not affiliated with, or endorsed by, ACAS, any NHS trust, NHS England, or any trade union.

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