More than 130 Public and Commercial Services (PCS) union members working at the Information
Commissioner’s Office are balloting for industrial action.
The staff, who administer and enforce the Data Protection and Freedom of Information Acts, are disputing a pay deal made in 2005.
The ballot is due to close on the 23 January.
The Information Commissioner’s Office is based in Wilmslow, Cheshire, and has regional offices in London, Edinburgh, Cardiff and Belfast.
The PCS also announced earlier this month that it would ballot 280,000 civil servants in more than 200 government departments about industrial action to resist compulsory redundancies.
