The rate of inflation unexpectedly fell to a two-and-a-half-year low last month, as declining oil prices started to filter through to the petrol pumps.
The average petrol price fell by 4.5p per litre between April and May to stand at 137.1p. Last year, the average petrol price rose 2p to 136.3p.
Inflation has fallen from 5.2% last September due to the waning impact of the VAT hike at the start of 2011 and falling energy, food and commodity prices, easing pressure on squeezed household incomes.
More top news
A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.