Thousands of people demonstrated in London on Saturday against the Government's cuts, demanding “health, homes, jobs and education”.
It is estimated that more than 50,000 took part in the People's Assembly National Demonstration, which began at about 1pm.
Pictures and videos from the scene in London showed thousands of demonstrators meeting near University College London, in Gower Street.
The demonstration travelled down Shaftesbury Avenue, through to Charing Cross Road and finished at Trafalgar Square.
Slogans such as "Cameron Must Go - Tories Out!" and demands for decent health, homes, jobs and education were brandished in the protest.
Kicking off the rally, the National Health Singers sang a song they had written, which included lines of "don't let our junior docs be worked around the clock", and "help us keep you safe, don't take our rights away".
Before the crowds set off, Labour shadow secretary for international development, Diane Abbott, spoke to the gathering.
The Hackney North and Stoke Newington MP said: "Fighting austerity is the political struggle of our time.
"It is austerity that is the real threat to the NHS. It is austerity which is stopping local authorities building homes.
"It is austerity that is forcing people out of work and into zero hours contracts.
"It is austerity that threatens the future of our young people.
"There could not be a more important demonstration or a more important movement than this one."
She told the crowd that this is "probably the biggest demonstration ever," and is "the right cause".
Chris Nineham, of Stop The War Coalition, said: "Austerity is not about economic necessity, it is a political choice."
He added: "We can now not just get rid of David Cameron, but the whole rotten Tory Government."
Labour's shadow chancellor John McDonnell, Unite general secretary Len McCluskey, NUT general secretary Christine Blower and Green Party leader Natalie Bennett also joined the demonstration.
They spoke at the rally in Trafalgar Square at the end of the march.
Thousands congregated in Trafalgar Square to listen to the speeches.
More than 100 coaches filled with demonstrators arrived in the capital from around the UK - with thousands of others attending through their associated unions or groups.
Michaella Hagger travelled to the demonstration from Winchester.
The 27-year-old who works in the probation service, said: "I'm here because I hate David Cameron.
"It's all about the cuts, tax dodging, and the NHS for me. They are ruining people's jobs and making it impossible for everyone," the Press Association reports.
The People's Assembly said the demonstration could be a “critical moment” as an “out of touch” government faces increasing pressure and scrutiny.