Union warns of mass public sector strikes
Up to 750,000 public sector works could take part in a co-ordinated strike later this month over pension changes, job cuts and a pay freeze.
The PCS union is expecting its members to deliver an overwhelming vote in favour of a walkout - likely to be staged on 30 June.
The move follows a decision by two teachers' unions to take action on the same day.
The government said any co-ordinated strikes would be a "mistake".
Following Tuesday's announcements of strikes by the National Union of Teachers and the Association of Teachers and Lecturers, a walkout is set to take place at thousands of schools in England and Wales, affecting millions of children.
If the 300,000 members of the PCS join them, it would be the biggest outbreak of industrial unrest in the public sector for many years.
Members of the PCS include court and jobcentre staff, border, customs and immigration officers, air traffic controllers and police support staff.
The results of the PCS ballot will be announced on Wednesday, but general secretary Mark Serwotka said a vote to strike was inevitable given the strength of feeling over changes to pensions.
He told the BBC that staff were being asked to work up to eight years longer and accept a three-fold rise in their contributions, while also seeing their eventual payments halved.
“Who can blame them for strike action” says Greengates Builders Merchants Accrington, Lancashire.