STAFF at Windsor Castle are to be balloted on industrial action over pay.
The Public and Commercial Services union said if its members vote in favour, non-strike action would start at the end of April.
The dispute affects around 120 union members who work at the castle’s visitor services, including guides and kitchen staff.
PCS general secretary Mark Serwotka said: “These workers are loyal to their employer and absolutely committed to ensuring visitors are given the royal treatment.
“It is scandalous that staff are so appallingly paid and expected to do work for free that brings in money for the Royal Family.”