However, wholesale fuel prices have only risen very slightly as a result of the pound weakening after the UK voted to leave the EU.

Unleaded went up 1.5p a litre and diesel by 1.66p in a month which saw oil finishing at $48 a barrel and the pound hitting a 31-year low against the dollar.

The impact of the 11% post-referendum fall in the value of the pound was softened by a simultaneous 6% drop in the oil price, meaning wholesale prices were largely unaffected.

The forecourt price rise, which has seen unleaded go up more than 10p a litre from 101.91p at the start of March to 112.17p at the end of June, means the cost of filling an average petrol family car has increased by £5.64 to £61.69 in four months.

The June pump price rise added 81p to the cost of a tank of petrol and 91p to a complete diesel fill-up. Diesel is now nearly 11p more expensive than at the beginning of March (101.56p to 112.39p), making a tank £5.96 dearer.

RAC fuel spokesman Simon Williams said: “June was another bad month for motorists with the price of petrol going up again. While it was only a penny and a half it makes for a rise of more than 10p since the start of March. Filling up with unleaded is now £5.64 more expensive which is enough to make an unpleasant dent in household budgets up and down the country, especially for those who have more than one car or need to fill up regularly.

“But it is good news that fuel prices are so far weathering the Brexit storm; wholesale prices have remained relatively stable after an initial small upward jolt as a result of the pound falling on news of the referendum result. The fact the oil price dropped at the same time lessened the negative effect of the pound’s devaluation. We may well see pump prices rise slightly in July, but current indications are that this is unlikely to be the shock rise some were predicting.”