Those balloted included clerks, receptionists, medical secretaries, waiting list and call centre staff working at Dewsbury, Pinderfields and Pontefract hospitals as well as community clinics across the Wakefield district.

BBC: Female hospital workers holding placards in protest

The action, by medical secretaries and receptionists, is due to start on 28 January, the union Unison said.

BBC: Mid Yorkshire Hospitals NHS Trust staff to strike

Administrative and clerical staff, including medical secretaries and receptionists, were balloted by the union, which said 88% voted in favour of strike action and 96% voted in favour of action short of a strike.

BBC: Mid Yorkshire Hospitals NHS staff vote to go on strike