Wildcat strikers claimed victory in a dispute over foreign labour on Wednesday when a contractor at a liquefied natural gas terminal agreed to withdraw 40 Polish construction workers and replace them with UK staff.

This week’s protest has been a rerun of the dispute earlier this year at the Lindsey oil refinery near Grimsby

The agreement at Milford Haven, west Wales, with Hertel UK will be put to a mass meeting this morning. It is expected to end a wave of unofficial strikes that on Wednesday involved more than 1,000 workers at seven refineries, terminals and power stations in England and Wales.