Anti-Brexit protesters are marching in London to call for a second referendum on Britain's departure from the bloc, less than six months before the divorce from the European Union becomes a reality.

Demonstrators from across the country on Saturday are demanding a "people's vote" to give the public the final say on the UK's political future.

The event intends to amplify the voices of British voters increasingly frustrated about the perilous state of negotiations between the UK and EU, and is organised by the People's Vote coalition of anti-Brexit campaign groups and the Independent newspaper.

"This week's fresh chaos and confusion over Brexit negotiations has exposed how even the best deal now available will be a bad one for Britain," said Andrew Adonis, People's Vote campaigner and Labour Party politician.

"Voters will neither forgive nor forget if MPs allow this miserable Brexit to proceed without people being given the final say."

Senior politicians from all major parties will speak at the rally, including London mayor, Labour's Sadiq Khan and Liberal Democrats' leader Vince Cable, as well as celebrities such as former England footballer Gary Lineker and TV chef Delia Smith.

"I'm opposed to the UK leaving the EU and I'm opposed to ending freedom of movement," said Steve Thomas, who had travelled to London for the rally. "I've always planned to retire to the continent. Looks like that's not going to happen for me now."

"I feel that the original referendum was a false premise. It wasn't clearly articulated what was on offer," said Sarah Williams, from London. "[A second referendum] gives people an opportunity to vote for something meaningful ... That wasn't done the first time around. I think it's worth fighting for."

"I don't think the current route they're heading on as far as Brexit's concerned is a very promising one and I think anything we can do to change it is a positive thing," said student Ben Carpenter, from Norfolk. "It's definitely important for young people. It's our future." (Aljazeera)

• Anti-Brexit protesters march through central London [Simon Dawson/Reuters]

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