NHS Pay

London Weighting vs HCAS: What's the Difference?

FP FrontlinePay Editorial
Updated September 2026 4 min read

Independent guidance — not affiliated with NHS England or DHSC

"How much is NHS London Weighting?" is one of the most common ways people search for information that, technically, no longer exists under that name. It's not a wrong question to ask — it just needs a small correction before it can be properly answered. This page exists purely to sort out that terminology confusion; for the actual current zone-by-zone figures, see the links further down rather than expecting a fresh table here.

Short answer

"London Weighting" is the older, informal term many people still search for — the current, correct NHS mechanism is the High Cost Area Supplement (HCAS), introduced when Agenda for Change replaced the old Whitley Council pay system across the NHS in 2004. HCAS works through Inner London, Outer London and Fringe zones, each with its own percentage addition to basic salary. This page explains the terminology and history — for the full zone-by-zone mechanics and worked examples, see our Band 5 salary guide and our Agenda for Change pay scales page.

The short version

"London Weighting" and "HCAS" both describe the same basic idea — extra NHS pay to reflect the higher cost of living in and around London — but they aren't simply two names for one current scheme. London Weighting was the mechanism used before Agenda for Change; HCAS is what formally replaced it in 2004 and remains the only mechanism actually written into current NHS pay circulars. If a job advert, forum post or older article says "London Weighting" in an NHS context today, the safe assumption is that it means HCAS — but the precise, current, correct term to use when checking official sources is HCAS.

Why so many people still search "London Weighting"

Search habits change slowly, and "London Weighting" had a long head start — it was in everyday use across multiple sectors for decades before Agenda for Change existed, and it remains the live, correct term in several of those other sectors today (more on that below). For anyone who worked in or around London public sector employment before 2004, or who's simply absorbed the phrase from general usage rather than NHS-specific sources, it's a completely natural term to reach for — it just doesn't match what NHS pay circulars, NHS Employers, or your trust's HR team will actually call it if you ask them directly.

What actually changed in 2004

Agenda for Change was a comprehensive overhaul of NHS pay, terms and conditions, replacing the previous Whitley Council system that had separately negotiated pay for different staff groups. As part of that reform, the previous London Weighting and fringe allowance arrangements were formally replaced by the High Cost Area Supplement — a structured, percentage-based addition to basic salary across three defined zones — introduced at the same time as the separate Recruitment and Retention Premium (RRP) mechanism, which addresses a genuinely different problem (hard-to-fill specific posts, rather than the general cost of living in an area). These were two distinct new tools introduced together, not the same tool given two different names.

London Weighting (pre-2004)

The mechanism used under the old Whitley Council pay system to reflect the higher cost of living in and around London. No longer the current NHS pay mechanism — formally replaced in the 2004 Agenda for Change reform.

High Cost Area Supplement (current)

The mechanism actually in NHS pay circulars today: a percentage addition to basic salary across Inner London, Outer London and Fringe zones, introduced as part of Agenda for Change in 2004 and updated with every pay award since.

HCAS today, at a glance

Since this page's job is resolving the terminology question rather than re-explaining the zone mechanics in full, here's just the headline 2026/27 picture — for the complete breakdown, minimum and maximum cash figures, and a full worked take-home pay example, see our Band 5 salary guide.

Inner London

20%

£5,794–£8,746 a year, 2026/27

Outer London

15%

£4,870–£6,137 a year, 2026/27

Fringe

5%

£1,346–£2,270 a year, 2026/27

NHS Band 5 Salary 2026/27

The full HCAS zone map, minimum and maximum cash figures, and a worked take-home pay comparison across every zone.

Try it

NHS Trust Comparison Tool

Pick two trusts and your band to see what each pays after tax, with and without HCAS, side by side.

Try it

Is "London Weighting" used correctly anywhere else?

Yes — and this is genuinely where a lot of the crossover confusion comes from. Several other UK public sector pay frameworks, including teaching, the civil service, the Metropolitan Police and various local authority structures, do still use "London Weighting" as their own live, current, correctly-named term, entirely separate from NHS pay. So it's entirely possible for "London Weighting" to be the exactly right term in one context and an outdated one in an NHS context, within the same job search — the term hasn't disappeared from UK employment generally, it's specifically the NHS mechanism that moved on to a different name.

ℹIf in doubt, ask which scheme is actually meant

If you see "London Weighting" mentioned in relation to an NHS role specifically, it's worth confirming with the recruiting trust or HR team that they mean HCAS — in the overwhelming majority of cases they will, but checking costs nothing and avoids any ambiguity, especially if you're comparing an NHS offer against a role in a sector (like teaching or the civil service) where "London Weighting" genuinely is still the correct, current term.

Does it actually matter which term you use?

For everyday purposes — understanding what a job advert means, or working out roughly what you'll be paid — no, not really; everyone will understand what you mean either way. It matters more in two specific situations: searching official sources directly (NHS Employers, pay circulars and your trust's HR system all use "HCAS," not "London Weighting," so searching the older term there may return nothing useful), and comparing pay across sectors, where using the wrong term for the wrong sector could genuinely cause confusion about which scheme, and which rates, actually apply.

Why you can rely on this page

  • ✓ The 2004 Agenda for Change reform, and its replacement of London Weighting with HCAS and the introduction of RRP, is well-documented NHS pay history, not a rounded assumption
  • ✓ We've deliberately not re-derived the full HCAS zone table here — the current figures live on our Band 5 salary and Agenda for Change pay scales pages, kept in sync with each new pay award
  • ✓ We've been explicit that other sectors genuinely do still use 'London Weighting' correctly, rather than implying the term is wrong everywhere
  • ✓ This page is dated and will be updated if HCAS zones or rates are restructured in a future pay award

NHS Band 5 Salary 2026/27

The full HCAS zone table and a worked take-home pay example.

Agenda for Change Pay Scales 2026/27

Every band and pay point, plus the full HCAS table.

Recruitment & Retention Premia Explained

The other mechanism introduced alongside HCAS in 2004, for hard-to-fill posts.

NHS Pay Calculator

Your exact salary including HCAS for your specific zone.

NHS HCAS Zones: Is Your Post Inner, Outer or Fringe London?

Official HCAS area lists, what each zone pays, minimum and maximum, worked example at every band (explainer, not a trust lookup).

Get notified if HCAS zones or rates change

We'll email you the moment a new pay award changes the Inner London, Outer London or Fringe percentages.

Free. Independent, not affiliated with the NHS. Every email has an unsubscribe link. See our privacy policy.

Frequently asked questions

Is London Weighting the old name for HCAS, or a different thing entirely? +
It's genuinely the historical predecessor — the same underlying idea (extra pay for the higher cost of working in and around London) delivered through a different, older mechanism before Agenda for Change was introduced across the NHS in 2004. When Agenda for Change replaced the old Whitley Council pay system, the previous London Weighting and fringe allowance arrangements were formally replaced by the High Cost Area Supplement (HCAS), so 'London Weighting' isn't simply an alternative name for the same current scheme — it refers to what came before it.
So why do so many websites and job adverts still say 'London Weighting'? +
Mostly habit and search behaviour rather than a genuinely separate current scheme. 'London Weighting' had decades to become the everyday phrase people use for 'extra pay for working in London,' across the NHS and well beyond it, and that habit has outlasted the specific mechanism it originally referred to. Some job adverts and informal descriptions still use it loosely to mean HCAS, which is understandable but technically imprecise — the correct current NHS term for the Agenda for Change payment is High Cost Area Supplement.
Does it actually matter which term I use when I'm checking my pay? +
Practically, no — if someone tells you a role includes 'London Weighting,' they almost certainly mean HCAS, and you'll get the right answer by checking the current Inner London, Outer London or Fringe HCAS percentage. It matters more if you're trying to search official sources or a pay circular directly, since NHS Employers, trust HR teams and pay circulars use 'HCAS,' not 'London Weighting' — searching the older term on an official site may return nothing.
What were the old London Weighting rates, and are they still relevant? +
The pre-2004 London Weighting and fringe allowance rates aren't relevant to current NHS pay at all — they were a different pay mechanism under an entirely different national pay system (the Whitley Council structure) that Agenda for Change fully replaced. Looking up a historical London Weighting figure won't tell you anything useful about your current HCAS entitlement; use the current HCAS percentages instead.
Do other public sector employers still use the term 'London Weighting'? +
Yes — this is actually where a lot of the ongoing confusion comes from. Teachers, civil servants, the Metropolitan Police and various local authority pay structures do still formally use 'London Weighting' as a live, current term in their own pay frameworks, genuinely distinct from NHS pay. So it's entirely possible to see 'London Weighting' used correctly and currently in one sector, and incorrectly (as a synonym for HCAS) in an NHS context, in the very same afternoon of job hunting.
Where do I find the actual current HCAS percentages and cash amounts? +
On our main Agenda for Change pay scales page and our Band 5 salary guide, both of which cover the full Inner London, Outer London and Fringe zone maps with current percentages and minimum/maximum cash figures, plus worked take-home pay examples. This page's job is specifically to resolve the terminology question — for the zone-by-zone mechanics themselves, those are the pages to use.
Was Recruitment and Retention Premium introduced at the same time as HCAS? +
Yes — both were introduced together as part of the 2004 Agenda for Change reform. HCAS addresses cost-of-living pressure tied to a specific geographic area, applied near-universally to everyone working there; RRP addresses recruitment or retention difficulty tied to a specific post or specialism, applied at an employer's discretion. They were designed as two different tools for two different problems within the same reform, not as alternative names for the same thing. See our dedicated guide to Recruitment and Retention Premia for how that separate mechanism works.

Free download: 2026/27 Agenda for Change pay scales

One page, every band, annual and hourly. We'll also email you when a pay award, back pay date or pay-scale change is confirmed.

Free. Independent, not affiliated with the NHS. Every email has an unsubscribe link. See our privacy policy.