GMB became the third union to call strike action for July 10 yesterday after members voted by three to one in favour. 

More than 26,000 members voted to fight the Con-Dems’ public-sector pay freeze compared with 9,000 who voted No in a ballot carried out by the Electoral Reform Society. 

It means GMB members will join over a million local government and school workers in England, Wales and Northern Ireland from other unions in the massive summer walkout.