UK inflation rises to 3.1% as motor-fuel prices push the headline rate higher

UK inflation rose for a second consecutive month in August, adding pressure to the economic outlook immediately before the Bank of England's September interest-rate decision.

The Consumer Prices Index increased by 3.1% in the 12 months to August 2026, according to figures released by the Office for National Statistics on 16 September. That was up from 2.9% in July and remained above the Bank of England's 2% target.

Transport costs, particularly motor fuels, made the largest upward contribution to the change.

Verified facts

CPI rose by 0.5% between July and August 2026. Prices had risen by 0.3% during the same month a year earlier, which contributed to the higher annual rate.

CPIH, which also includes owner-occupier housing costs and Council Tax, increased by 3.3% annually. That was up from 3.1% in July.

The annual transport inflation rate rose from 3.6% to 4.6%. Transport prices increased by 1.5% during August, compared with a 0.4% monthly rise in August 2025.

Goods inflation increased from 2.2% to 2.7%, its highest rate since September 2025.

The underlying measures were more stable. Core CPI remained at 2.6%, CPI services inflation remained at 3.4%, core CPIH remained at 2.9%, and CPIH services inflation remained at 3.6%. Food and non-alcoholic beverage inflation was unchanged at 1.3%.

What changed beneath the headline?

The rise in headline inflation was concentrated mainly in transport, particularly motor fuels. Six of the twelve main spending divisions made upward contributions to the change in the annual CPI rate, while two made downward contributions. There was no large offsetting downward contribution.

This matters because a rise driven by volatile fuel prices can have different implications from a broad acceleration across services and core prices. Core CPI and services inflation were unchanged, suggesting that the underlying picture did not deteriorate as sharply as the headline rate alone might imply.

That does not make the increase irrelevant. Higher fuel costs affect households directly and can raise costs for businesses throughout supply chains.

What it means for the Bank of England

The figures arrive one day before the Bank of England's scheduled monetary-policy announcement on 17 September.

An above-target headline rate may make the Bank more cautious about reducing interest rates. However, today's data do not provide a simple policy signal.

Core and services inflation were stable, while the labour-market figures published on 15 September showed falling payroll employment and fewer vacancies. The Monetary Policy Committee must weigh those signs of weaker demand against the renewed increase in headline inflation.

The Bank received exceptional pre-release access to the inflation estimate on 14 September for its policy meeting.

What it means for investors

Persistently higher inflation can affect expectations for the timing and pace of interest-rate changes, government bond yields and prices, borrowing costs, consumer spending power and the relative performance of different equity sectors.

These effects are not automatic. Market prices reflect expectations as well as published figures, and tomorrow's Bank of England decision will include its assessment of the wider evidence.

The Apolifina view

The headline has worsened, but the detail is less dramatic.

CPI rising to 3.1% is unwelcome and reinforces the case for caution on interest rates. Yet unchanged core and services inflation suggest that August did not produce a broad new acceleration in domestic price pressure.

The combination of softer employment indicators and higher fuel-led inflation leaves the Bank facing a familiar trade-off: weaker economic momentum alongside inflation that remains above target.

Uncertainty

Inflation measures describe average price movements and will not match every household's experience. Individual inflation rates vary according to spending patterns.

Monthly movements can also be volatile. Motor-fuel prices may reverse direction, while services inflation tends to change more gradually. One month should therefore be assessed alongside longer-term trends.

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