UK consumer price inflation accelerated to 3.1% year-on-year in August, up from 2.9% in July, reaching its highest level in five months. The 0.2 percentage-point increase matched economists’ expectations and pushed headline inflation further above the Bank of England’s 2% target.
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The acceleration was primarily driven by transport costs, particularly petrol, diesel and airfares. The data highlight the sensitivity of headline Consumer Prices Index (CPI) inflation to changes in global energy markets, even as several measures of underlying domestic inflation remain stable.
At 3.1%, headline CPI is now 1.1 percentage points above the BoE target, indicating that the disinflation process remains incomplete.
Motor Fuel Drives the Inflation Increase
Motor fuel prices generated the largest upward contribution to the annual inflation rate. Average petrol prices increased by 9.1 pence per litre between July and August, while diesel prices rose by 14.2 pence per litre.
The sharp increase in fuel prices creates multiple inflationary transmission channels. Higher crude oil prices increase household transportation costs directly while also raising expenses for logistics companies, manufacturers and other fuel-intensive businesses.
Higher long-haul airfares also contributed to the increase, reinforcing the impact from energy-sensitive transportation services.
Core CPI and Services Inflation Hold Steady
The underlying inflation picture was considerably more stable. Core CPI remained at 2.6% for the fourth consecutive month, while services inflation held at 3.4%.
The 0.5 percentage-point gap between headline and core CPI indicates that the latest acceleration was concentrated partly in volatile components rather than representing a broad-based increase across the consumer basket.
For monetary policy, services inflation remains particularly important because services prices are generally more closely linked to domestic wages and demand conditions. The unchanged 3.4% reading therefore provides limited evidence of a fresh acceleration in domestically generated inflation.
Labour-market data showed regular pay growth of 3.5% in the three months to July. The moderation in wage growth compared with earlier periods suggests that domestic cost pressures are not accelerating at the same pace as energy-related inflation.
Bank Rate Remains at 3.75%
The inflation release comes with the Bank Rate at 3.75%. At its previous policy meeting, the Monetary Policy Committee voted 6-3 to maintain rates, while three members supported a 25-basis-point increase to 4.00%.
Financial markets had been pricing approximately a 20% probability of a quarter-point increase at the September policy meeting. The relatively limited probability reflected the conflicting signals within the inflation data.
Headline CPI above 3%, accelerating producer prices, and higher energy costs represent upside risks. Conversely, core CPI at 2.6%, services inflation at 3.4% and regular pay growth at 3.5% suggest that underlying domestic pressures have not accelerated alongside headline inflation.
The key monetary-policy risk is the emergence of second-round effects. If higher energy prices trigger stronger wage demands, broader corporate price increases or persistent services inflation, a temporary supply shock could become embedded in the domestic inflation process.
Producer Prices Show Strong Upstream Pressure
Producer-price data indicate that inflationary pressure is also building within the supply chain. Producer input prices increased 6.1% year-on-year in August, compared with a revised 5.8% increase previously. Factory-gate output prices rose 3.7%, accelerating from a revised 3.3%.
The divergence between input and output inflation is significant. Manufacturers are experiencing substantially higher production costs, but the increase in final selling prices remains smaller.
Companies can initially absorb higher costs through reduced margins, but prolonged input inflation can increase the probability of cost pass-through to wholesalers, retailers and consumers.
Energy remains a central component of this transmission mechanism. Higher prices for crude oil and refined petroleum products can increase transportation, manufacturing and distribution expenses across multiple sectors.
Inflation Outlook Remains Energy-Dependent
The medium-term inflation outlook will depend heavily on the duration and magnitude of the energy-price shock. Changes in wholesale energy markets can also influence regulated household energy prices with a time lag, meaning the full impact may emerge gradually.
Goldman Sachs expects UK inflation to reach approximately 3.9% in early 2027, substantially above the 2% target. Such an outlook increases the importance of monitoring services inflation, wage growth, producer prices, inflation expectations and energy costs.
Conclusion
The rise in UK CPI to 3.1% represents a renewed energy and transport-driven inflation shock. Petrol increased by 9.1p per litre, diesel by 14.2p, while producer input inflation reached 6.1%. However, underlying measures remained comparatively stable, with core CPI at 2.6%, services inflation at 3.4% and regular pay growth at 3.5%.
The central monetary-policy question is whether higher energy and production costs remain temporary or generate persistent second-round inflation effects through wages, services, and broader consumer prices.