At a Trades Union Congress meeting next month union bosses are expected to thrash out plans to create a mass walkout in the spring in protest at spending cuts.
The talks will bring together unions which have industrial action ongoing, such as British Airways and London Underground, and urge others to hold strike ballots to tie in with a TUC rally which is due to take place in late March.
Mark Serwotka, leader of the Public and Commercial Services Union, which has 300,000 members, said further strikes were “inevitable”.
He told The Times: “We are looking at the spring. The more of us that stand together against the cuts, the more problems we can create. Unless you look like you want a fight, they won’t negotiate. The Government has to see we are serious.”
Union bosses hope to organise mass walkouts at the end of April, on the few working days sandwiched between the Easter weekend of April 22 – 25, the royal wedding on April 29 and the May Day bank holiday on May 2.
Mr Serwotka said the royal wedding “would not be a factor in our planning but nor would it be a factor to avoid”, adding that BBC journalists drew concessions from their management after threatening to walk out during the Conservative Party conference in October.
Unison, Unite and the GMB said they would lend their weight to anti-cuts action next year.
Brendan Barber, TUC general secretary, said: “This could well be the year that the country starts to say ‘No’ to Government in a way that they have not since middle Britain made a previous Conservative government abolish the poll tax.”
In the event of a mass walkout Ed Miliband would be forced to decide whether to support the unions or condemn the action.
The Labour leader was elected with help from unions and the party is reliant on union funding, but in his speech at the Labour Party conference Mr Miliband condemned some strikes as “irresponsible.”