They will be joined by fellow Public and Commercial Services Union (PCS) members across four government departments and agencies in a day of action short of a strike, also on the 30 March.
The action is part of the next steps of the PCS’s national civil service dispute over jobs, pay and conditions. The action will see people refusing to do paid or unpaid overtime and taking proper rest and lunch breaks.
Mark Serwotka, PCS general secretary, said: “Civil servants are among the lowest paid in the public sector, with thousands earning just above the minimum wage and a quarter earning less than £15,400.
“It is scandalous that while the rest of the economy enjoys pay rises in line with inflation that the government and civil service management seek to impose a real terms pay cut for the people who keep this country running.”