Union in dispute with some of its own staff over pay and home working

Exclusive: Office staff at Salford HQ of Usdaw - who are represented by GMB union - reject pay offer

One of the UK's biggest trade unions is facing potential strike action from some of its own staff in a dispute over pay and home working, a threat that the union's general secretary has condemned as unnecessary and self-indulgent.

In a bitter internal wrangle at one of the unions most strongly supportive of the Labour leader, Keir Starmer, office staff at the Salford headquarters of Usdaw, which represents retail workers, have rejected a pay offer from the union of 3.5%.