From north and south, from east and west - from all corners of Britain legions of ordinary women, men and children will gather tomorrow to raise a great cry of resistance against the unending misery of Tory "austerity."
Tens of thousands will fill the streets of London, Glasgow and Belfast representing the Conservative coalition's millions of victims.
For Welsh marchers Richard Evans, Cerith Griffiths and Steffan Ap Dafydd it marks the culmination of a mammoth 156-mile walk from Cardiff.
The trade unionists reached London last night following their epic journey.
An exhausted Mr Evans, who is a member of Civil Service union PCS, declared his hope that Labour figures such as leader Ed Miliband, who will address the crowd but will not march, would commit themselves fully to a people's future.
"I want to hear from Labour speakers that they will be reversing any cuts, that they will be trying to put people back into work," he told the Morning Star.
Thousands will arrive tomorrow in more conventional fashion as hundreds of specially chartered coaches and trains sweep into the centres of political power.
London's Hyde Park and Glasgow's George Square will host co-ordinated mass rallies to hear speakers tear apart the government's cuts agenda and put forward an alternative vision of society.
Trade unionists gave a taster today with a rallying cry to people across Britain.
Scottish TUC deputy general secretary Dave Moxham declared that austerity had "failed in Scotland, England, Wales and Ireland and across the whole of Europe.
"Tomorrow is a day when workers and communities from across these islands come together to say that the fundamental attacks we face are the same - attacks on jobs, cuts in services, a corrupted tax system and poverty pay," he said.
"Scottish workers want to be part of the fightback."
In England public-sector union Unison general secretary Dave Prentis said that the aim tomorrow is to "tell this shower of a coalition that they are wrong, wrong, wrong.
"They are wrong to make ordinary people pay with their jobs and their futures for a deficit that none of them caused."
His call was echoed by education unions battling the privatisation of the sector.
National Union of Teachers general secretary Christine Blower warned: "The brutal cuts that have been made to the public sector alongside the attacks on education and the health service have gone too far.
"It's time to end the government's failed austerity programme and to repair the damage it has caused."
And RMT general secretary Bob Crow urged trade unionists to follow up tomorrow's protest with plans for a wave of strike action.
"There's only thing that this rotten government understands as it attempts to batter working-class communities into submission and that is the power and force of numbers as we mobilise sheer physical resistance out on the streets and in the workplace," he said.
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