Some one million people were estimated to have joined the Put It To The People march in central London today, organisers said.

Organised by the People’s Vote, Britain for Europe and Open Britain, protesters demanded the public be given a final say on the Brexit process.

Campaigners seeking a second referendum started in Park Lane at midday before gathering at Parliament Square for a series of speeches, with demonstrators tailing back through the route shown on aerial footage.

On stage Labour’s deputy leader Tom Watson addressed Theresa May's own speech this week when she told voters fed up of Brexit that "I am on your side".

He said: “Have a look out of the window prime minister. Open your curtains. Switch on your TV. Here are the people. Theresa May - you don’t speak for us.”

Best pictures from the Put It To The People protest Show all 65 1 /65 Best pictures from the Put It To The People protest Best pictures from the Put It To The People protest Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal EPA Best pictures from the Put It To The People protest Young marchers sit on the lions at Trafalgar Square in London Angela Christofilou/The Independent Best pictures from the Put It To The People protest A young marcher speaks into a megaphone Angela Christofilou/The Independent Best pictures from the Put It To The People protest Anti-Brexit campaigners gather in Parliament Square PA Best pictures from the Put It To The People protest 800sqm banner of a David Davis quote Led By Donkeys/PA Best pictures from the Put It To The People protest Put It To The People protest 23 March 2019 Angela Christofilou/The Independent Angela Christofilou/The Independent Best pictures from the Put It To The People protest A demonstrator holds a placard during a Peoples Vote anti-Brexit march in London, Saturday, March 23, 2019. The march, organized by the People's Vote campaign is calling for a final vote on any proposed Brexit deal. This week the EU has granted Britain's Prime Minister Theresa May a delay to the Brexit process. (AP Photo/Tim Ireland) Tim Ireland AP Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Peter Nicholls PETER NICHOLLS Reuters Best pictures from the Put It To The People protest LONDON, ENGLAND - MARCH 23: Thousands of demonstrators take to the streets of London during the Peoples Vote March on March 23, 2019 in London, England. Organised by the Peoples Vote Campaign the rally brought thousands of people from all over the country to the march through the streets with campaigners calling for the final Brexit deal to be put to the people. (Photo by Ian Forsyth/Getty Images) Ian Forsyth Getty Best pictures from the Put It To The People protest l EPA Best pictures from the Put It To The People protest Norman Cook aka Fat Boy Slim with the Stop Brexit Sound System, Thousands of people flocked around the Stop Brexit Sound system as it wound it's way through crowds. Artists such as Fat Boy Slim, Deadmau5, Gideön and members from Orbital, Desert Storm Sound System, Horse Meat Disco, Secretsundaze and others blasted beats to protest the UK's exit from the EU and the impact Brexit will have on artists and musicians in the UK and in EU countries. Neneh Cherry also made an appearance. The soundsystem took a surprise turn into a side street near the National Gallery where a truck with sound system and DJs including Norman Jay (MBE) awaited. Thousands of pro-EU party people rocked out to house tracks including a remix of Donna Summer's disco classic I Feel Love. People with banners filled out the space as a police helicopter hovered above. Authorities allowed the music to continue for an hour or so before it was switched off. Revellers helped collect rubbish before peacefully moving on Anu Shukla Best pictures from the Put It To The People protest epaselect epa07458575 Protesters with a banners 'You don't speak for Me' attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest A man clibs from a bus as he joins demonstrators Getty Best pictures from the Put It To The People protest Scientists for EU march Angela Christofilou/The Independent Best pictures from the Put It To The People protest A placard 'I will always love EU' during the 'Put it to the People' march EPA Best pictures from the Put It To The People protest epa07458289 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest Put It To The People protest 23 March 2019 Angela Christofilou/The Independent Angela Christofilou/The Independent Best pictures from the Put It To The People protest A group of marchers wear The Independent's Final Say t-shirts Angela Christofilou/The Independent Best pictures from the Put It To The People protest People attend a rally organised by the pro-European People's Vote campaign for a second referendum in central London on March 23, 2019. - Hundreds of thousands of pro-Europeans from across Britain were expected to march through London on Saturday calling for another referendum on EU membership with the country mired in political paralysis over Brexit. (Photo by Niklas HALLE'N / AFP)NIKLAS HALLE'N/AFP/Getty Images NIKLAS HALLE'N AFP/Getty Best pictures from the Put It To The People protest A group of marchers sit in the road Angela Christofilou/The Independent Best pictures from the Put It To The People protest epa07458310 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest A float in the march by Trafalgar Square Angela Christofilou/The Independent Best pictures from the Put It To The People protest Editor of The Independent Christian Broughton addresses the marchers Angela Christofilou/The Independent Best pictures from the Put It To The People protest Marchers stand below Nelson's Column Angela Christofilou/The Independent Best pictures from the Put It To The People protest Put It To The People protest 23 March 2019 Angela Christofilou/The Independent Angela Christofilou/The Independent Best pictures from the Put It To The People protest A young marcher edits his sign Angela Christofilou/The Independent Best pictures from the Put It To The People protest People hold up placards and European flags AFP/Getty Best pictures from the Put It To The People protest A box of foam hands are handed out Getty Best pictures from the Put It To The People protest epa07458288 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest A banner with British Prime Minister Theresa May and slogan 'Enemy of the People' EPA Best pictures from the Put It To The People protest LONDON, ENGLAND - MARCH 23: Demonstrators gather as they prepare to take to the streets of London during the Peoples Vote March on March 23, 2019 in London, England. Organised by the Peoples Vote Campaign the rally brought thousands of people from all over the country to the march through the streets with campaigners calling for the final Brexit deal to be put to the people. (Photo by Ian Forsyth/Getty Images) Ian Forsyth Getty Best pictures from the Put It To The People protest Leader of the Liberal Democrats Sir Vince Cable MP takes part Getty Best pictures from the Put It To The People protest Put It To The People protest 23 March 2019 Angela Christofilou/The Independent Angela Christofilou/The Independent Best pictures from the Put It To The People protest LONDON, ENGLAND - MARCH 23: Thousands of demonstrators take to the streets of London during the Peoples Vote March on March 23, 2019 in London, England. Organised by the Peoples Vote Campaign the rally brought thousands of people from all over the country to the march through the streets with campaigners calling for the final Brexit deal to be put to the people. (Photo by Ian Forsyth/Getty Images) Ian Forsyth Getty Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Peter Nicholls PETER NICHOLLS Reuters Best pictures from the Put It To The People protest Thousands of demonstrators take to the streets Getty Best pictures from the Put It To The People protest epa07458298 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest A protester with a banner 'Strong and Stable or just Stubborn?' EPA Best pictures from the Put It To The People protest epa07458317 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458330 A protester attends the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458316 People with banners 'His Future' (L) and "My Future' attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458329 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458308 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458328 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458296 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest Marchers hold up an EU flag Angela Christofilou/The Independent Best pictures from the Put It To The People protest epa07458303 People attend the 'Put it to the People' march in TLondon, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest epa07458348 People with placards 'Mogg Off' attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/FACUNDO ARRIZABALAGA FACUNDO ARRIZABALAGA EPA Best pictures from the Put It To The People protest A marcher holds a familiar sign Angela Christofilou/The Independent Best pictures from the Put It To The People protest Demonstrators carry posters and flags during a Peoples Vote anti-Brexit march in London, Saturday, March 23, 2019. The march, organized by the People's Vote campaign is calling for a final vote on any proposed Brexit deal. This week the EU has granted Britain's Prime Minister Theresa May a delay to the Brexit process. (AP Photo/Tim Ireland) Tim Ireland AP Best pictures from the Put It To The People protest A man with a placard 'We Love EU' EPA Best pictures from the Put It To The People protest epa07458321 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Kevin Coombs KEVIN COOMBS Reuters Best pictures from the Put It To The People protest Marchers show The Independent's Final Say t-shirt Angela Christofilou/The Independent Best pictures from the Put It To The People protest Demonstrators carry posters and flags during a Peoples Vote anti-Brexit march in London, Saturday, March 23, 2019. The march, organized by the People's Vote campaign is calling for a final vote on any proposed Brexit deal. This week the EU has granted Britain's Prime Minister Theresa May a delay to the Brexit process. (AP Photo/Tim Ireland) Tim Ireland AP Best pictures from the Put It To The People protest A marcher wears The Independent's Final Say t-shirt Angela Christofilou/The Independent Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Henry Nicholls HENRY NICHOLLS Reuters Best pictures from the Put It To The People protest epa07458323 People attend the 'Put it to the People' march in London, Britain, 23 March 2019. Hundreds of thousands of people take part in the protest calling for a referendum on the final Brexit deal. EPA/NEIL HALL NEIL HALL EPA Best pictures from the Put It To The People protest Open Labour protesters Angela Christofilou/The Independent Best pictures from the Put It To The People protest A float depicting British Prime Minister Theresa May EPA Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Kevin Coombs KEVIN COOMBS Reuters Best pictures from the Put It To The People protest EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participate in the 'People's Vote' march in central London, Britain March 23, 2019. REUTERS/Kevin Coombs KEVIN COOMBS Reuters Best pictures from the Put It To The People protest EDITORS PLEASE NOTE LANGUAGE ON SIGNS. Anti-Brexit campaigners take part in the People's Vote March in London. PRESS ASSOCIATION Photo. Picture date: Saturday March 23, 2019. See PA story POLITICS Brexit March. Photo credit should read: Yui Mok/PA Wire Yui Mok PA Best pictures from the Put It To The People protest Anti-Brexit campaigners take part in the People's Vote March in London. PRESS ASSOCIATION Photo. Picture date: Saturday March 23, 2019. See PA story POLITICS Brexit March. Photo credit should read: Yui Mok/PA Wire Yui Mok PA Best pictures from the Put It To The People protest LONDON, UNITED KINGDOM - MARCH 23: Protesters take part in the Put It To The People March on March 23, 2019 in London, England. Thousands of protesters gathered in central London to take part in the Put It To The People March, organised by the Peoples Vote campaign, from Park Lane to Parliament Square, calling for a public vote on the Governments final Brexit deal. (Photo by Dan Kitwood/Getty Images) Dan Kitwood Getty

And Michael Heseltine told marchers that the EU represented "parliamentary democracies working together with power based on a shared sovereignty far in excess of anything any one of us could achieve individually" over decades.

People came from across the country to join the demonstration. Sorcha Kirker, 27, travelled from Orkney and told The Independent: "This is too important to miss because of something like geography. It’s our future."

The march took place as Ms May fought to stay in office, with ministers reportedly plotting to oust her. In a letter to MPs she did not guarantee that she would bring her deal back to the Commons for a third meaningful vote, amid suspicions it would fail to pass again.