Unite the union have called for fuel tanker drivers to reject proposals made by Acas, the industrial mediation service. The move from the union means a strike is increasingly likely.

Diana Holland, Unite assistant general secretary said delegates recognised good progress had been made in addressing some concerns, but that more improvements were needed if they are to back a deal.

She said: “The proposals represent progress on some of the key areas such as health and safety. But it is clear that they do not give enough guarantees that the instability and insecurity gripping the industry will come to an end.”

The oil trades conference, a group of union leaders, recommended the 2,000 drivers reject the proposals. The drivers, from seven firms, can vote on the proposals until 11 May.

Diana Holland added: “It is in everyone’s interest that we end the contract merry go round and the erosion of standards in a vital industry. Delegates at the oil trade conference felt the proposals did not meet members’ expectations and are recommending that members reject them in the consultative ballot.”