Almost a third of the workers at the Lindsey Oil Refinery are to lose their jobs.
The Insolvency Service said 125 employees would be made redundant at the end of October, with 255 people remaining at the site at North Killingholme, in North Lincolnshire.
The refinery was taken over by the government’s official receiver in June after its owner, Prax Group, went into administration.
The Unite union said the government was “responsible for the redundancies going ahead, as it could provide support to ensure the refinery is kept intact and operational”.
