Customers looking to get fixed price contracts should do it as soon as possible, according to Inenco’s Y report.

Energy Analyst Dorian Lucas said a Greek deal would potentially strengthen the Euro and lead to an increase in UK prices.

Those on flexible price contracts with “relatively high exposure” should also review them.

On the other hand, Mr Lucas believes contracts which will be out in 2016 or beyond should wait this week to see how the Iranian nuclear deal ends.

Six key international powers are currently negotiating with the Government of Iran.

According to Mr Lucas, there are four sanctions to be removed from Iran and up to a million barrels of oil could enter the market by 2016.

He added: “That could potentially see [oil] prices decline across the board.”