UK Market Breakdown: Builders Fly as Gilts Ease, Week of 14 September 2026

London's week so far has been a story about the bond market as much as the stock market. Across the three completed sessions from Monday's open to Wednesday's close, the FTSE 100 finished at 10,697.57, 10,658.13 and 10,688.47 — up 0.4%, down 0.4%, then up 0.28% — a round trip that left the index a shade higher but concealed a violent rotation underneath.

The single biggest story arrived on Wednesday, when Barratt Redrow reported full-year results and its shares jumped close to 12%, reported as the housebuilder's biggest one-day percentage gain in nearly six years. The trigger was company-specific — adjusted pre-tax profit of £572.8m, ahead of analyst forecasts — but the follow-through was macro. Ten-year gilt yields, which had touched a 19-year high of 5.43% earlier in the month, eased back towards 5.35% after August inflation landed broadly as expected, and every rate-sensitive corner of the market moved with them.

Brent crude did the rest. It climbed above $108 a barrel on Tuesday after fresh attacks on Saudi infrastructure, then settled 2.7% lower at $105.83 on Wednesday once Washington said a damaged pipeline would restart within days.

The FTSE 100

Monday set the defensive tone. The index added 0.4% to 10,697.57 as money moved into healthcare and consumer staples at the start of a week loaded with central bank decisions, while gilt yields resumed their climb. The oil majors were the visible winners: Shell rose about 1% to roughly 3,592p and BP gained a similar amount, with Brent trading near $107 after strikes on Gulf infrastructure and shipping.

Tuesday reversed it. The FTSE 100 slipped 0.4% to 10,658.13 as Brent pushed more than 2% higher to around $108, gilt yields rose again and a weak UK labour market report landed at 07:00. Financials dominated the fallers — HSBC dropped 2.2%, Barclays 1.9% and Lloyds 0.6% — on worries about the growth cost of a sustained oil shock rather than anything company-specific. Miners went with them, Glencore off 2.5% and Antofagasta down 2.37%.

Wednesday was the rate-sensitivity trade in its purest form. With oil retreating and gilt yields backing off, the FTSE 100 recovered 0.28% to 10,688.47 even though the day's UK inflation print was the highest in five months. The FTSE 350 household goods and home construction index rallied around 7% and the construction and materials index about 4.6% — by far the strongest sector moves of the week in London. Notably, the index closed before the US Federal Reserve announced its decision; that landed in the evening, UK time, and belongs to Thursday's session, not Wednesday's.

Taken together, the three sessions netted out to a gain of roughly a quarter of a percent — modest, but a stabilisation after the previous week, when the index fell for five straight sessions to a seven-week low around 10,610.

The FTSE 250 and mid caps

The mid-cap index tracked the same arc but with more conviction at the end of it. The FTSE 250 fell 0.6% to 23,834.48 on Monday, drifted 0.1% lower to 23,818.74 on Tuesday, then jumped 1.06% to 24,070.20 on Wednesday as gilt yields retreated — a bigger one-day gain than the FTSE 100 managed, which is what you would expect from an index far more exposed to UK domestic demand and UK borrowing costs.

Individual updates were mixed. WH Smith guided full-year pre-tax profit to about £75m, the bottom of its previously indicated £75m to £90m range, blaming higher costs, heavier promotional activity and weaker passenger traffic in North America, with the war in Iran compounding the margin squeeze. The shares opened at 350p against Tuesday's 362.8p close and touched 345.6p, a fall of roughly 4.7%, before recovering almost all of it to trade near 362.4p.

Smaller companies produced the week's sharpest single disappointment. MJ Gleeson reported audited results for the year to 30 June 2026 showing revenue up 12.1% to £410m but a pre-tax loss of £2.7m against a £20.5m profit a year earlier, driven by a collapse in land transactions — Gleeson Land contributed £10m of revenue, down 43.2% — alongside a sharply reduced dividend. The shares fell around 2% to near 241.5p. On AIM, Aeorema Communications went the other way, raising full-year profit guidance after a strong start to its second half.

The week's biggest movers

The AI-disruption theme remains the most consequential thing happening to the FTSE 100's quality-growth cohort. RELX, Experian and Informa were the index's three heaviest fallers on Tuesday, all down more than 2%, with Informa off 2.52% at 880.6p. London Stock Exchange Group fell about 2.7% to around 8,276p the same day. The concern is not this quarter's numbers but whether increasingly capable AI tools let large customers do in-house what they currently pay these companies to do — a re-rating of the moat, not the earnings.

At the other end, the defence pair did the heavy lifting on Tuesday. BAE Systems closed 3.4% higher at 2,006p on elevated volume and Babcock added roughly 3.4% to 993.6p, both lifted by escalating Middle East hostilities and the expectation that customers accelerate spending plans. Kingfisher also rose 2.26% to 294.4p, joining Marks and Spencer and Persimmon in a consumer-and-property bid that briefly pulled the index off its lows before oil and the jobs data dragged it back.

Company news in focus

Mitie shareholders approved the recommended cash acquisition by OCS Group International this week, clearing the way for a deal valuing the facilities management group at about £3.1bn at 218.5p per share in cash. The court meeting passed with 1,027 shareholders representing 94.90% of those voting in favour, and 99.74% of votes cast; the general meeting's special resolution carried with 99.76%. Completion still needs regulatory approvals and court sanction, and is expected during the first quarter of 2027.

Babcock used its AGM trading update on Wednesday to confirm a CAD$1.2bn (about £0.6bn) six-year extension to lead Victoria Class submarine in-service support for the Royal Canadian Navy, with scope to extend further towards the fleet's expected end of life. The group also flagged the £200m share buyback launched in July, which it expects to complete by the end of FY27, and a £250m six-year sterling bond issued under its Euro Medium Term Note programme.

Debenhams Group, the AIM-listed retailer formerly known as Boohoo, sold the Nasty Gal brand to New York-based White Space Group for $16m (£11.9m) in cash on Tuesday, continuing a disposal programme that has also included the £90m sale of its Sheffield distribution centre. The shares were down 3.6% at 23.80p in the afternoon.

FTSE Russell's September quarterly review also lands this week. easyJet and Ithaca Energy join the FTSE 100, while Entain and Persimmon drop into the FTSE 250 — a reminder of how far the housebuilder has fallen, even on a week when its shares rose. Changes are implemented at the close on Friday 18 September and take effect from the start of trading on Monday 21 September.

Earnings and trading updates

Barratt Redrow's full-year numbers were the substantive report of the week. Revenue rose 6.6% to around £6.06bn and completions increased 5% to 17,667 homes, while adjusted pre-tax profit fell 7.1% to £572.8m — a decline, but ahead of analyst forecasts, which is what mattered on the day. The group ended the year with net cash of £772.8m having paid £242.2m in dividends and completed £100m of buybacks, and reiterated a £400m capital return for FY27, the bulk of it a roughly £386m buyback. The caveat sat in the guidance: adjusted completions for 2026-27 were trimmed to between 17,500 and 17,900 from 17,700 to 18,200, blamed on planning delays and fewer sales outlet openings than planned.

Babcock's update was quieter but clean — trading in line with expectations, full-year outlook and medium-term guidance unchanged, with continued strong performance in Nuclear and Aviation and robust demand across core defence markets. Half-year results are due on 19 November.

WH Smith's guidance cut was the week's clearest example of the oil shock reaching the income statement rather than just the index, with management explicitly citing the Iran conflict as an aggravating factor on margins. Full preliminary results follow on 12 November. MJ Gleeson, meanwhile, told the market not to expect a meaningful improvement in housing conditions in the near term, the opposite message to the one Barratt Redrow's order book delivered a day later.

Macro and the Bank of England

UK CPI rose to 3.1% in the year to August, up from 2.9% in July and the highest in five months, on ONS figures published on Wednesday. Transport did the damage, with annual inflation in the category jumping to 4.6% from 3.6%: petrol rose 9.1 pence a litre to 161.3p and diesel 14.2 pence to 181.8p, taking motor fuel inflation to 23.0% from 15.5%. Crucially for the Bank, the underlying picture was calmer — core CPI held at 2.6% and services inflation came in at 3.4%, just under the 3.5% consensus. CPIH rose to 3.3% from 3.1%.

Tuesday's labour market data was the softer half of the pair. Unemployment held at 4.9% in the three months to July, better than the 5.0% expected, but payrolled employment fell 26,000 in August against forecasts of a 5,000 drop — the fastest pace of job losses in nine months, leaving payrolls 145,000 lower than a year earlier at 30.2 million. Vacancies fell to 702,000, the lowest since 2021, while regular pay grew 3.5%.

That combination — sticky headline inflation, cooling labour demand — let the gilt market breathe. Ten-year yields slipped towards 5.35% from a 19-year high of 5.43%, and traders trimmed Bank of England tightening bets, with roughly four quarter-point rises now priced through the end of next year against five previously. Sterling was subdued throughout, near a one-month low around $1.347 on Tuesday and at 1.3469 on Wednesday. The Federal Reserve then raised US rates by 25 basis points to 3.75%–4% on a 12-0 vote, its first increase since 2023 — after London had closed.

Still to come

The Bank's decision is the one that matters for the gilt-led rotation described above. Three MPC members voted for a rise at the 30 July meeting, and with services inflation at 3.4% the split rather than the headline is where the information will be.

This article is for information and education only. It is not financial advice or a recommendation to buy, sell or hold any investment. Always do your own research.