Trade unions representing a million state employees are drawing up plans for strikes that could bring Britain's schools, universities, courts and Whitehall to a standstill as early as June in protest over government plans to end so-called "gold-plated" public sector pensions, the Guardian has learned.

Lord Hutton, the Labour former work and pensions secretary charged by the coalition with reviewing public sector pensions, will publish his final report on Thursday, and it now looks likely to act as a starting gun for extended industrial action against the government's austerity programme.