UK Stock Market Today (17 December 2025): FTSE 100 Rallies as Inflation Surprise Fuels Bank of England Rate-Cut Bets

LONDON — 17 December 2025. UK equities finished higher on Wednesday, with the FTSE 100 closing up 0.9% at 9,774.32 after stronger gains earlier in the session, as a sharper-than-expected drop in inflation strengthened expectations of a Bank of England (BoE) rate cut on Thursday. The more domestically focused FTSE 250 added 0.6% to 22,164.76, while the AIM All-Share rose 0.3% to 751.48. ^[1]

The day’s rally was broad-based but rate-sensitive sectors took the spotlight: housebuilders advanced on the prospect of cheaper mortgages, banks rallied on upgrades and a wider European financials bid, and energy shares stabilised as oil prices firmed again. ^[2]

UK market snapshot: FTSE 100, FTSE 250, AIM and the biggest theme

London’s blue-chip index traded as high as 9,853.13 before easing back into the close, still ending the day firmly in the green. The FTSE 250 also finished higher, extending a rebound that has increasingly tracked shifting expectations for UK borrowing costs. ^[3]

The macro catalyst was clear: official data showed UK inflation cooled more than economists expected, removing a key uncertainty ahead of the BoE’s final policy decision of the year. ^[4]

The data that moved markets: UK inflation drops to 3.2%

The Office for National Statistics (ONS) reported that the Consumer Prices Index (CPI) rose 3.2% year-on-year in November 2025, down from 3.6% in October, while CPI fell 0.2% month-on-month. ^[5]

Crucially for rate expectations, underlying measures also softened:

Core CPI (excluding energy, food, alcohol and tobacco) eased to 3.2% from 3.4%. ^[6]
CPI services inflation cooled to 4.4% from 4.5%. ^[7]
Food and non-alcoholic beverages inflation slowed, with the ONS highlighting falls in categories such as cakes, biscuits and breakfast cereals, and noting a higher share of discounting linked to Black Friday compared with last year. ^[8]

Reuters reported the CPI reading undershot all forecasts in its economists’ poll, reinforcing the view that the BoE now has room to cut rates as growth has softened. ^[9]

Why UK stocks rallied: rate-cut logic meets a weaker pound

Markets typically respond to cooler inflation in two connected ways:

Lower expected interest rates can lift equity valuations by reducing discount rates and easing financing conditions.
Sterling often weakens when investors price in rate cuts, which can support internationally exposed UK companies by boosting the value of overseas earnings when translated back into pounds.

Wednesday delivered both dynamics.

Sterling slid sharply after the inflation release, with Reuters reporting the pound was down 0.7% versus the dollar, touching $1.3343, and also weakening against the euro. ^[10]

At the London equity close, the pound was quoted around $1.3359, lower than Tuesday’s $1.3429, according to the London Stock Exchange’s market wrap. ^[11]

Sectors in focus: banks, housebuilders, energy and miners

Banks lead as upgrades and Europe’s financials bid intensify

Banking shares were among the strongest performers.

Reuters reported the FTSE 350 Banks index rose 2.9% to its highest level since 2008, with HSBC up 3.8% (supported by a brokerage upgrade), while Barclays and Standard Chartered also gained more than 2%. ^[12]

The UK bank rally echoed a broader European move: Reuters noted bank stocks were among the biggest contributors to gains across the region, helped by a mix of improved market conditions, deal activity and regulatory expectations. ^[13]

Housebuilders jump as “rate-sensitive” trades return

Lower inflation — and the higher conviction around a BoE cut — pushed investors back into rate-sensitive UK domestic names, particularly housebuilders.

The London Stock Exchange’s close report highlighted Barratt Redrow up 3.7% and Persimmon up 2.3% as markets leaned into the “mortgage relief” narrative. ^[14]

Energy steadies as oil prices firm on Venezuela supply fears

Oil also mattered in London today.

Energy stocks jumped in the morning session and remained supportive into the close as oil prices firmed. Reuters linked the move to a sharp rise in oil after the U.S. announced a blockade of sanctioned oil tankers tied to Venezuela. ^[15]

By the London close, Brent crude was quoted at $59.91 a barrel, up from $59.01 late Tuesday, according to the LSE market wrap, with Shell and BP both higher. ^[16]

Miners benefit from commodity strength

Mining names gained amid positive commodity signals. Reuters highlighted strength in mining shares as silver hit record highs and gold prices edged up, supporting resource-linked equities across Europe and the UK. ^[17]

Stock movers: winners and losers UK investors watched today

Beyond the macro story, several UK-listed names drove headlines:

Serco surged after upgrading guidance and lifting its outlook for underlying operating profit; the LSE close report noted the stock rose 7.4%, with Serco now expecting around £270 million of underlying operating profit for 2025. ^[18]
Bunzl fell after warning its 2026 operating margin is expected to be slightly lower year-on-year; Reuters and the LSE wrap both flagged Bunzl as a notable decliner on the day. ^[19]
Phoenix Group gained after a UBS upgrade to “buy”, while Glencore rose following a Berenberg upgrade, per the LSE close report. ^[20]
Among the FTSE 100’s biggest fallers, the LSE close report listed DCC, Bunzl, ICG, Weir, and IMI. ^[21]

Gilts and the rate outlook: markets all but lock in a BoE cut

The inflation surprise didn’t just move shares — it reset pricing across UK rates and bonds.

Reuters reported that interest-rate futures priced a near-100% probability of a 25 basis point BoE cut on Thursday, with gilt yields falling on the shift in expectations. ^[22]

IG’s market analysis also described a decisive bond reaction, reporting gilt yields fell across the curve and citing a drop of around seven basis points in two-year yields, reflecting UK-specific repricing after the CPI surprise. ^[23]

Meanwhile, the London Stock Exchange’s close report cited analyst commentary suggesting the inflation print effectively removed the last obstacle to a cut, and it also referenced money-market repricing after the data:

Money-market odds for a cut on Thursday rose to 97% (from 92%), according to the Peel Hunt view relayed in the report. ^[24]
Expectations for the total number of cuts over the next year increased to 2.7 from 2.4 (as described in the same market wrap). ^[25]

What the BoE might do next: the key question is guidance, not the cut

With markets heavily leaning toward a Thursday cut, investors are increasingly focused on what happens after the decision:

Is the BoE signalling a “one-and-done” insurance cut, or
A more sustained easing cycle into 2026?

Reuters noted the BoE had kept policy unchanged by a narrow margin at the last meeting and that investors were already positioning for the next step, while also reiterating the BoE’s own longer-term concern that inflation could remain above target for an extended period. ^[26]

The same Reuters reporting also pointed to the possibility of another close vote and highlighted that policymakers remain split on how to balance cooling inflation against labour market risks and underlying price pressures. ^[27]

Global backdrop: central banks and Wall Street volatility remain in play

The UK story was dominant for London trading, but global context still shaped risk appetite.

Reuters flagged a busy week for monetary policy decisions across Europe, including the ECB, Sweden’s Riksbank, Norway’s Norges Bank, and the Bank of England. ^[28]

At the time of the London equity close, US markets were lower, according to the LSE wrap (with the Nasdaq down more than 1%), underscoring that UK equities were outperforming on a distinctly domestic macro catalyst. ^[29]

UK stock market forecast: what investors are watching into year-end and early 2026

Based on today’s reporting and market pricing, the UK stock market narrative heading into the final stretch of 2025 is likely to hinge on three interlocking themes:

1) The path of rate cuts

Today’s inflation data strengthened expectations not just for a cut this week, but for the possibility of additional easing into 2026, as reflected in futures pricing and analyst commentary. ^[30]

2) Sterling direction

Sterling weakness can be a tailwind for parts of the FTSE 100 with overseas revenues, but it can also amplify imported inflation risks — something the BoE will weigh as it communicates its next steps. ^[31]

3) Commodity-driven volatility

Oil’s move today (linked to Venezuela-related supply fears) and the continued strength in parts of the metals complex can keep UK index leadership rotating between energy, miners and defensives, depending on headlines and positioning. ^[32]

Tomorrow’s diary: the next catalysts for UK markets

According to the London Stock Exchange market close report, Thursday’s calendar is heavy:

Interest-rate decisions in the UK, euro area, Norway, and Sweden
US inflation data
UK corporate focus includes Currys half-year results ^[33]

Bottom line: The UK stock market’s strong session on 17 December 2025 was a classic “macro takes over” day: an inflation surprise pushed markets to price in a BoE cut, weakened the pound, and lifted rate-sensitive sectors — all while oil’s rebound helped keep heavyweight energy names supportive. ^[34]

Why Is the FTSE-100 Index at All-Time Highs as the U.K. Economy Unravels?