The numbers have been visible for years. A Grade 7 Site Reliability Engineer at the Government Digital Service earns between £56,850 and £81,720 annually — a range published on Civil Service Jobs in August 2026 as a matter of standard civil service practice. A senior DevOps engineer doing comparable infrastructure work at a London financial services firm earns up to £160,000 in total compensation, per CareerCheck's August 2026 sector analysis. That ratio — 2x base-to-base, closer to 3x on total compensation — has been visible in civil service postings for the better part of a decade. The information asymmetry runs in reverse of what is usually assumed: it is the public sector that has always disclosed its numbers. The question the Employment Rights Act 2025 forces onto private employers is what changes when they are required to do the same.
The ERA 2025, which received Royal Assent in June 2025 and began taking operational effect from April 2026, extends mandatory gender pay gap reporting and introduces Equality Action Plans — requiring employers with 250 or more staff to publish plans addressing their gender pay gap, voluntary from April 2026 and mandatory from spring 2027. It does not mandate salary disclosure in job advertisements. That provision — requiring employers to publish a salary or salary range in all vacancy notices, or provide the information in writing to candidates before interview where no advert exists — is the subject of a separate government call for evidence that closed on 30 June 2025, with legislation expected before the end of the current parliamentary term (Lewis Silkin analysis, July 2026). When it arrives, GDS and HMRC Digital will not gain new transparency obligations. They will gain company.
What the Civil Service Actually Pays
The national floor for a Grade 7 post — the grade spanning senior technical specialists, senior developers, and lead SREs across Whitehall — stands at £52,120 for 2026-27 under the Cabinet Office Pay Remit Guidance published in May 2026. GDS, now operating within DSIT following a Q1 2025 structural transfer of Cabinet Office digital teams that expanded DSIT's headcount by 17.7% between Q3 2024 and Q3 2025, posts above that floor. Its G7 SRE and developer roles carried ranges of £56,850 to £81,720 on Civil Service Jobs in July and August 2026, reflecting the Government Digital, Data and Cyber Pay Framework adopted across 36 government organisations as of mid-2026. At G6 — roughly equivalent to a staff engineer or senior principal in private-sector terms — GDS posts a Head of Government Cyber Implementation at £70,175 to £87,305 (~$93K–$116K at Q2 2026 GBP/USD of ~1.33) and a Head of Digital Service Portfolio at £63,343 to £70,725 in London. Most departments apply a London pay differential of approximately £3,000 to £5,000 above national rates at each grade, giving the Marsham Street and Whitehall digital estate a modest geographic premium over GDS's out-of-London hubs in Manchester and Bristol — but no structural adjustment that narrows the distance to the King's Cross AI corridor.
HMRC Digital, which maintains HMRC's AWS and Azure estate and operates systems processing approximately 40 million annual self-assessment returns (HMRC Annual Report and Accounts 2025-26), runs on departmental pay scales below the GDS framework rates. A Senior Enterprise Architect at G6 at HMRC Digital carries a posted salary of £58,541, against the GDS G6 cybersecurity equivalent at £70,175 minimum — a £12,000 intra-grade disparity between departments at nominally the same civil service level, a consequence of departmental pay autonomy within the Cabinet Office remit ceiling. NHS England's Digital Directorate — which absorbed NHS Digital in 2023 and operates NHS Spine, NHS App, and the national clinical data infrastructure — pays under the Agenda for Change framework rather than civil service grade bands. Following the 3.6% pay award accepted by NHS England in May 2026, Band 7 (senior clinical informatics specialists and IT team leads) spans £46,148 to £52,809. Band 8a, covering experienced data architects and senior systems engineers, runs £53,754 to £63,862. Band 8b, encompassing principal architects and senior IT leadership, reaches £74,896 nationally — with no automatic London weighting under AfC. An NHS principal architect in Leeds and an NHS principal architect at the Digital Directorate's London office advertise at the same England rate.
The Private Sector Benchmark
Revolut — the London-headquartered fintech — pays software engineers in Greater London between £60,900 and £165,000 in total compensation, per Levels.fyi data for 2026, with a median of approximately £110,000. Senior engineers on infrastructure and platform teams, roles structurally equivalent to a GDS G7 SRE or HMRC Digital G6 technical lead, report base salaries of £75,000 to £110,000 plus equity. Revolut holds an active Skilled Worker sponsor licence and clears the £38,700 Home Office salary threshold by a multiple of two or more at all senior grades. Morgan McKinley's 2026 DevOps salary guide for London places the senior band at £90,000 to £140,000 base. CareerCheck's August 2026 sector analysis puts London financial services DevOps specifically at up to £160,000 in total compensation including bonus — the figure that sits 2x above the GDS G7 ceiling of £81,720 on a like-for-like base comparison, and approximately 3x on total comp when accounting for bonus and equity that civil service bands do not carry.
Cloud security engineering at senior level in London — a specialism with direct equivalents at HMRC Digital, which manages HMRC's security posture across its public cloud estate, and at NHS England — commands £105,000 to £140,000 base, per Optima Europe's 2026 salary survey. BT Group, as a reference point for the non-lab, non-fintech private sector employer, pays software engineers £34,000 to £51,000 at most seniority levels per Glassdoor UK (383 submissions, August 2026), though its specialist AI engineering function at Adastral Park in Ipswich and Aztec West in Bristol operates at £82,000 to £120,000 base for senior engineers (ENTRA internal survey data, Q2 2026). The private sector premium over civil service pay is therefore not uniform — BT's median software engineering pay sits below the GDS G7 floor — but it concentrates exactly where public sector attrition is most costly: cloud infrastructure, cybersecurity, and senior architecture roles where skills are scarcest and where GDS and HMRC Digital compete for the same engineering profiles as Revolut, Wise, and the Cambridge-to-London fintech pipeline.
How the Employment Rights Act 2025 Changes IT Pay Disclosure
The Employment Rights Act 2025 creates an Equality Action Plan obligation that is, for now, the primary new transparency mechanism applying to private sector employers with 250 or more staff. Those plans — which must document specific measures to address gender pay gaps, including in technology functions where sector gaps routinely exceed 15% — become mandatory from spring 2027. They require strategy on paper, not band disclosure in postings: a large fintech can satisfy the requirement without publishing what it pays a senior platform engineer. The salary disclosure consultation is the provision that would change that. The government's call for evidence sought views on three specific options — exact salary, salary range, or a benchmark rate — for mandatory disclosure in vacancy notices, with a parallel provision requiring the same information to be shared in writing before interview where no advert exists. The scope, as drafted, encompasses both private sector employers and public bodies advertising on external job boards. GDS and HMRC Digital already comply in practice. The effect of the incoming legislation, when it passes, will be to surface the full private sector picture on the same search results page where a candidate is reading a civil service posting — and to remove the last residual friction from the comparison.
Can the Civil Service Pay Framework Slow IT Attrition?
The CDDO's structural instrument is the Government Digital, Data and Cyber Pay Framework, adopted by 36 organisations as of mid-2026. DSIT's permanent secretary Emran Mian argued in May 2026 that universal departmental adoption could save more than £100 million per year by substituting contractor expenditure with permanently employed specialists at revised framework rates (publictechnology.net, May 2026). The 2026-27 Cabinet Office Pay Remit, published in May 2026, permits departments with acute recruitment and retention pressures to apply for above-remit pay flexibility, with business cases due to Cabinet Office and HM Treasury by 31 October 2026. These are the instruments available. The question is whether they are calibrated to the scale of the problem.
Sixty-six percent of UK public sector organisations report persistent difficulty filling digital and data roles, per Sellick Partnership's 2026 public sector recruitment survey — a figure that has not materially shifted across three years of framework publication and iterative Pay Remit flexibility. Pay transparency legislation, when it produces salary disclosure in vacancy notices, delivers two effects simultaneously: it gives private employers a statutory comparator from which the public sector can argue a Treasury case for above-remit rates, and it gives every senior civil servant browsing the private sector job market a precise number to weigh against their current band. The Government Digital and Data profession's challenge is not information. The profession's challenge is that the information, once it becomes universally disclosed and routinely comparable, forecloses the argument that the public-private gap is approximate. When the gap is exact, the question of whether to tolerate it becomes exact too.
Civil service grade floor figures (G7 £52,120 national minimum) per Cabinet Office Pay Remit Guidance 2026-27, published May 2026. GDS G7 SRE and developer salary ranges (£56,850–£81,720) per Civil Service Jobs postings, July–August 2026, also sourced via Women in Tech Jobs listings. GDS G6 Head of Government Cyber Implementation (£70,175–£87,305) and Head of Digital Service Portfolio London (£63,343–£70,725) per Civil Service Jobs and Women in Tech Jobs postings, 2026. HMRC Digital Senior Enterprise Architect (G6, £58,541) per Civil Service Jobs via Haystack, 2026. NHS England Agenda for Change Band 7, 8a, and 8b figures per NHS Pay Bands 2026/27 at 3.6% award, confirmed May 2026 by NHS England. Revolut software engineer compensation per Levels.fyi Greater London Area data, 2026. Morgan McKinley DevOps salary guide 2026 (London senior band £90K–£140K base). CareerCheck London DevOps sector analysis, August 2026 (financial services sector up to £160K total compensation). Optima Europe cloud security engineer salary UK 2026 (senior band £105K–£140K base). BT Group software engineer salary data per Glassdoor UK, 383 submissions, August 2026. Employment Rights Act 2025 Royal Assent date (June 2025) and in-force provisions per Lewis Silkin LLP analysis, July 2026. Pay transparency call for evidence (close date 30 June 2025) per UK Government Equal Pay and Pay Discrimination Consultation document. DSIT/CDDO digital pay framework adoption (36 organisations) and £100M+ annual savings estimate per Emran Mian, permanent secretary, DSIT, as reported by publictechnology.net, May 2026. DSIT headcount increase (17.7%, Q3 2024 to Q3 2025) per Whitehall Monitor 2026, Institute for Government. Cabinet Office Pay Remit 2026-27 above-remit business case deadline (31 October 2026) per GOV.UK. Sellick Partnership public sector recruitment survey 2026 (66% figure). GBP/USD conversion rate ~1.33 per Q2 2026 market data, consistent with ENTRA Q2 2026 regional reporting. BT Group AI engineering compensation (£82K–£120K base) per ENTRA internal survey data, Q2 2026 — not a third-party public benchmark. None of the salary figures are confirmed by the named employers; all civil service figures are from publicly posted vacancy notices.
For voluntary pay transparency trends across UK AI employers — Wayve, ElevenLabs, and the King's Cross AI corridor — see UK AI Salary Banding: The Voluntary Transparency Shift in 2026. For BT Group's distributed AI engineering build at Adastral Park, Aztec West, and Belfast, see BT Cuts 55,000, Adds 1,200 AI Engineers Outside London. For GCHQ's Cheltenham technology cluster and the intersection of government cybersecurity and private-sector pay, see Cheltenham: GCHQ, Cyber, and the AI Remote Hub.
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