[vahid-ahmadi]

Corrects the Warm Home Discount planning page (docs/book/programs/gov/ofgem/warm-home-discount-plan.md), written for #502.

The page itself is already on main: it shipped in #2386 (merged 21 October 2026), and its original .added changelog entry was released in 2.143.0. This branch has merged main, dropped the released fragment and now carries only corrections to main's copy of the page.

What this PR corrects (from its changelog fragment):

Corrected the Warm Home Discount plan (docs/book/programs/gov/ofgem/warm-home-discount-plan.md): the April-to-March scheme year, the Scottish core group under Schedule 1 to SI 2026/488, the pre-2022 rebate amounts, the 2025-26 qualifying benefits, the helpline route and the ESA take-up caveat.

The claim-by-claim review behind these corrections, with sources, is in the "Ready for hub review" comment on this PR.

• Changelog fragment: changelog.d/502-warm-home-discount-corrections.changed.md (changed).
• Docs and changelog only; no code changes.

🤖 Generated with Claude Code

[MaxGhenis]

UK hub (Claude build session, for Max)
Ready for hub review

Head: cd7484ee2b06c4f779778c75741df56a61d312e0

Read this first. The page is already on main, word for word, through #2386 (d50ee85a9, merged 2026-10-21). Its changelog line shipped in 2.143.0 (CHANGELOG.md:189).

This branch now:

• merges main at c65bced64 (merge commit 78cb1023d);
• deletes changelog.d/502.added.md;
• corrects main's copy;
• adds changelog.d/502-warm-home-discount-corrections.changed.md.

Against main, the diff is the page and the fragment. Suggested title on landing: "Correct the Warm Home Discount plan".

Status of the plan. Main still does not model the WHD: there is no warm_home variable or parameter, and programs.yaml lists only energy_price_guarantee under Ofgem. Draft #2504 implements Phase 1 and is not merged. The plan stays useful until #2504 lands. After that, Phase 1 should become a programme page and the plan should shrink to the Scottish phases. The page now points to #2504.

Claims checked (main a45baf5e4, re-checked on c65bced64)

Claim	Verdict	Source
£150 rebate; not modelled	true	SI 2026/389 reg 3(1) "a rebate of £150"; git grep -i warm_home on main finds nothing
SI 2026/389 runs 1 April 2026 to 31 March 2031; it replaces SI 2022/772 (England and Wales)	true	reg 1(2) and reg 4(2)(b) (review agent); the Explanatory Note says "2030", which conflicts with the operative text
High-cost-to-heat test was "under the 2022 Regulations"	fixed: it sat in the eligibility statements made under them; the 2025-26 statement removed it	2025-26 eligibility statement: "Through the removal of the property high cost to heat threshold…"
2.7 million more households; "more than 6 million households"	2.7m true; fixed the source: the response's foreword counts "more than 6 million" families; households are "around 6.1 million" in the impact assessment	government response PDF; impact assessment PDF (pdftotext)
—	added: the 2025-26 list included income-based JSA and IS, with Guarantee Credit as Core Group 1 (needed for model year 2025)	2025-26 eligibility statement
2026-27 qualifying date 23 August 2026; UC, HB, income-related ESA, PC; name on the bill	true	https://www.gov.uk/the-warm-home-discount-scheme/if-you-live-in-england-and-wales
"The rebate is applied automatically"	fixed: most households through data matching; others call the helpline by 26 February 2027	same page
SI 2026/488 in force 1 May 2026 to 2031, replacing SI 2022/1073; £150	true	SI 2026/488 regs 1, 3, 4
Scottish core group (GOV.UK paraphrase)	fixed to Schedule 1: PC; UC Condition A (disabled child) or B (not in work + child under 5 or LCW/LCWRA); IS and JSA(IB) (child under 5 or listed premiums); ESA Conditions A-D; mortgage-interest loans	https://www.legislation.gov.uk/uksi/2026/488/schedule/1/made
Broader group by application; supplier criteria; 23 August 2026	true	GOV.UK Scotland page; reg 25
Not in Northern Ireland (Energy Act 2010 extends to GB)	true	Energy Act 2010 s. 37 (review agent)
"£140 before winter 2022-23"	fixed: £120 / £130 / £135 in scheme years 1-3, then £140	https://www.legislation.gov.uk/uksi/2011/1033/regulation/2
Qualifying-benefit parameter	qualified: it must vary by scheme year	—
Take-up carries through esa_income	fixed: esa_income is reported receipt	variables/gov/dwp/esa_income.py:17-20
"paid without a claim"	qualified: a minority must call the helpline	GOV.UK
Phase 2 inputs	fixed: needs the work condition and legacy premiums; there is no pensioner-premium or mortgage-interest-loan variable	grep of policyengine_uk/variables
Ofgem pages give recipients and spend	relinked to reports-and-data, which holds the figures	https://www.ofgem.gov.uk/environmental-and-social-schemes/warm-home-discount-whd/warm-home-discount-whd-reports-and-data (200)
"The scheme year runs from October to March"	false: 1 April to 31 March; rebates are paid from late October to 31 March	SI 2026/389 reg 3(1) "scheme year"; GOV.UK
Electricity account; #2189 domestic electricity VAT	true; #2189 is open	reg 11(3)(a); #2189

Corrections: 12.

Uncertain

• SI 2026/389's Explanatory Note says 2030 against reg 4(2)(b)'s 2031. The page follows the operative text.
• I don't know why GOV.UK's Scotland summary leaves out the IS, JSA and ESA limited-capability routes.
• The Scottish qualifying date rests on GOV.UK alone, because SI 2026/488 sets no customer qualifying date.

Full ledger: ~/reviews/uk-hub/jobs/docs-c2/b/1735-ledger.md.