UK Market Breakdown: Gilts Bite, Bidders Circle, Week of 31 August 2026

London came back from the Summer Bank Holiday to a global bond sell-off, and it shaped everything that followed. The London Stock Exchange was shut on Monday 31 August, so the week so far amounts to just two sessions — and the FTSE 100 finished lower in both.

The blue-chip index closed Tuesday at 10,789.28, down 34.98 points or 0.32%, then slipped again on Wednesday to 10,756.45, a fall of 32.83 points or 0.30%. Measured from Friday 28 August's close of 10,824.26, that leaves the FTSE 100 down roughly 0.6% for the week to date. The damage was heavier further down the market: the FTSE 250 fell 0.8% on Wednesday to 24,324.06, its lowest since 4 August, and the AIM All-Share lost 0.8% to 790.01.

The driver was the gilt market. Renewed fighting between the United States and Iran pushed Brent crude above $95 a barrel and revived inflation worries, sending the 10-year gilt yield to 5.268% on Wednesday, its highest since June 2008. Against that backdrop, London's takeover wave carried on regardless — three UK-listed companies agreed deals on Tuesday alone.

The FTSE 100

For an index with as much energy and commodity weight as the FTSE 100, an oil price spike is usually a cushion, and so it proved. Brent climbed through $91 a barrel on Tuesday and above $95 by Wednesday, its highest since 24 July, after Iran launched attacks on US sites across the Middle East following an extensive American bombardment. Traders spent both sessions pricing the risk of disruption to flows through the Strait of Hormuz.

That handed the oil majors the top of the leaderboard. BP closed Tuesday up 5.7%, the single best performer in the index, while Shell also gained. Reuters had BP up 3.9% and Shell up 1.6% at the midday mark before both firmed further into the close. Without them, a soft week would have looked considerably worse.

The offset came from precious metals. Gold had retreated to around $4,450 an ounce, close to a two-week low, over the long bank holiday weekend, after Federal Reserve chair Kevin Warsh used his Jackson Hole address to warn that further monetary tightening may be needed if inflation stays above target. That pushed the dollar and bond yields up and bullion down, and London's precious metals miners took the hit: Reuters had the sub-sector down 7.1% at one stage on Tuesday, leading sectoral losses. Endeavour Mining closed Tuesday down 5.8%, Fresnillo down 5.3% and Antofagasta down 5.2%.

Wednesday was a quieter, grinding session rather than a rout. The index was down 0.56% at 10,728.90 by 10:10 GMT before recovering some ground, with miners weighing early on and the oil majors again lending support. Investors were also reluctant to commit ahead of Friday's US jobs report.

The FTSE 250 and mid caps

The mid-cap index bore the brunt, which is what tends to happen when the move originates in gilts rather than in oil. The FTSE 250 is far more domestically exposed than the FTSE 100, and a jump in UK borrowing costs feeds directly into mortgage pricing, consumer credit and the discount rate applied to domestic earnings.

Tuesday was severe in the middle of the day — Reuters had the FTSE 250 down 1.9% by 1019 GMT and on course for its biggest one-day drop since March — before a substantial recovery into the close. Wednesday brought no relief, with the index sliding 0.8% to that one-month low.

Rate-sensitive domestic sectors led the falls. Housing goods and home construction dropped 3.3% on Tuesday and a further 2.3% on Wednesday. Retailers were hit hard too: Reuters reported Marks and Spencer down 3.95%, Dunelm off 3.85% and B&M European Value Retail sliding 4.61% as gilt yields climbed.

Not everything in the mid and small caps was macro-driven. TT Electronics jumped as much as 11.9% on Wednesday on a well-received set of half-year numbers, and AIM-listed Gamma Communications was the subject of an agreed £1bn takeover — a reminder that the junior market's persistent discount continues to attract buyers even in a poor week for sentiment.

The week's biggest movers

BP was the week's clearest beneficiary of the geopolitics. With Brent climbing through $91 and then $95, and with a large slice of its earnings geared to the crude price, it closed Tuesday up 5.7% and led the FTSE 100.

Reckitt Benckiser had a genuinely company-specific week. On Monday a US federal jury cleared its Mead Johnson infant nutrition arm of liability in the first federal trial over claims that Enfamil premature infant formula caused a fatal bowel disorder. JP Morgan analyst Celine Pannuti then upgraded the stock to overweight on Tuesday in a wider note on European consumer staples. The shares added around 4.7% on Tuesday, though they gave back about 1.9% on Wednesday.

TT Electronics was the standout small-cap move, rising as much as 11.9% to 151p on Wednesday, its highest since November 2025, after half-year adjusted operating profit rose 37% and the board guided full-year profit ahead of market expectations.

Endeavour Mining, Fresnillo and Antofagasta were on the other side of the ledger. Higher bond yields raise the opportunity cost of holding non-yielding metals, and with Warsh signalling that US rates may still need to go higher, the precious metals complex sold off and London's miners followed it down.

Company news in focus

The dominant corporate story was M&A. Bloomberg reported on Tuesday that UK-targeted takeovers have passed $100bn for 2026 after a summer surge, and three separate London deals landed that same day.

Bodycote, the heat-treatment specialist listed in London since 1972, agreed a takeover by US private equity firm Veritas Capital worth about £1.65bn, or £1.85bn including debt. Shareholders receive 940p a share in total value — 932.8p in cash plus the previously declared 7.2p FY26 interim dividend. Veritas raised its offer to see off CVC, having disclosed indicative proposals of roughly 914p to 915p in early August. The board recommended the offer unanimously and the shares rose 4.5%.

Gamma Communications, the AIM-listed business communications provider, agreed a roughly £1bn ($1.4bn) offer from UK buyout firm Epiris at 1,120p a share — a 53% premium to where the stock traded on 7 April, the day before it disclosed it was in talks.

Capricorn Energy agreed a $396m (£292m) sale to Norway's DNO, switching its recommendation away from Genel Energy after DNO tabled a bid $36m higher. The deal would end Capricorn's 38-year run on the London market.

Wednesday brought FTSE Russell's September quarterly review. easyJet and Ithaca Energy will join the FTSE 100, while Entain and Persimmon drop into the FTSE 250. Entain has fallen about 30% this year, hit by the rise in UK remote gaming duty from 21% to 40%, and Persimmon is down about 13%. easyJet's promotion may prove brief: it agreed a £5.7bn cash takeover by Apollo Global Management on 6 August. The changes are implemented at the close on Friday 18 September and take effect on Monday 21 September.

Broker moves mattered on Wednesday. UBS upgraded InterContinental Hotels Group to buy from neutral, lifting its target to $188 from $157.65 and sending the shares up 3.1% to the top of the FTSE 100. Morgan Stanley raised NatWest Group to overweight from equal weight, though it trimmed its target to 750p from 850p, and the shares added 0.6%. Citigroup went the other way on Pearson, cutting it to neutral from buy after a roughly 40% rally since February; the shares fell about 2%, even as Citi nudged its target up to 1,345p.

Earnings and trading updates

The corporate reporting calendar was thin, as it usually is in the first week of September, but two results stood out.

Bunzl reported first-half figures on Tuesday. Revenue came in at £5.93bn, up 2.9% at constant exchange rates, with adjusted operating profit up 8.0% and an operating margin of 7.3%. The distribution group upgraded its 2026 outlook and announced a £500m share buyback, funded from cash generation and existing balance sheet capacity. The shares changed hands around £27.92 in early trading, not far from a 52-week high of £28.94.

TT Electronics followed on Wednesday with the week's most emphatic reaction. First-half adjusted operating profit rose 37.0% to £18.5m from £13.5m, with the adjusted operating margin up 230 basis points to 8.1%, even as revenue fell 2.7% at constant currency — a turnaround driven by mix and cost rather than volume. The order book stood at about £550m at the end of June, up 20% year on year, with a book-to-bill ratio of 112%. Chief executive Eric Lakin said the group had moved from "operational turnaround to disciplined execution and delivery", and the board now expects full-year adjusted operating profit ahead of the roughly £35m company-compiled consensus. The shares rose as much as 11.9%.

Elsewhere, Ryanair — not a London-listed stock, but a read-across for UK airline investors — trimmed its FY27 traffic guidance on Wednesday from 216m to 214m passengers, citing a need to cut exposure to unhedged jet fuel costs over the winter.

Macro and the Bank of England

The gilt market was the week's main event. Ten-year yields rose about seven basis points on Tuesday to around 5.23%, their highest since June 2008, and pushed on to 5.268% on Wednesday. Reuters reported the 30-year yield at 5.71%, the highest since 1998. This was not a purely British story — long-dated bonds sold off across major economies as investors focused on government debt levels — but it lands awkwardly in the UK, with Chancellor John Healey due to deliver his first Budget on 28 October.

Rate expectations moved sharply. Markets went into the week pricing roughly 24 basis points of Bank of England tightening by year end and came out of Tuesday pricing at least 31 to 32 basis points. Bank Rate stands at 3.75%, held on 30 July in a 6–3 vote, with Megan Greene, Catherine Mann and Huw Pill all voting for an immediate rise to 4%.

The data was mixed. S&P Global's final UK manufacturing PMI for August, published Tuesday, slipped to 51.7 from 51.9 in July — the weakest since March, though above the 51.5 flash estimate, and factories hired at the fastest pace in more than two years. Bank of England money and credit figures the same day showed mortgage approvals for house purchase at 56,053 in July, the lowest since January 2024 and down 15% year on year, with net mortgage borrowing falling to £4.3bn from £7.7bn in June. The most recent inflation reading, for July, had CPI at 2.9%, up from 2.6% and a four-month high, with services inflation easing to 3.4%.

Sterling weakened, slipping to about $1.3514 on Tuesday and touching $1.35025 on Wednesday, its weakest since 19 August, as a firmer dollar and risk aversion outweighed the rise in UK yields.

Still to come

The August inflation print on 16 September lands the day before the Bank of England's next decision, so the two releases will be read together.

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.