UK annual inflation accelerated to 3.5 percent in September, exceeding economists' forecasts of 3.4 percent and rising from 3.1 percent in August, according to the Office for National Statistics.

The increase was driven by climbing fuel prices resulting from the conflict in the Middle East, which pushed the cost of diesel past £2 per litre. The data presents a challenge for Chancellor John Healey ahead of his upcoming budget.

More details are expected as the story develops.