Labour staff are said to be furious over delays to an expected pay rise.
The party’s general secretary Jennie Formby is yet to meet with unions for annual pay negotiations that affect hundreds of Labour staff after a pay request was submitted in October. Normally negotiations are completed and a deal agreed by the end of January.
It comes amid persistent rumours that the party is struggling to make room in its budgets for a potential general election.
Staff have also been left in the dark over their pensions after proposals to switch from a final salary to a career average scheme were announced before Christmas before being hastily withdrawn. Formby is reported to have defended final salary schemes in her former job at Unite the union.
Reports of bumper pay rises of up to £18,000 for some of Jeremy Corbyn’s closest aides last year have done nothing to ease tensions.