Brexit march: Million joined Brexit protest, organisers say
Protesters carrying EU flags and placards called for any Brexit deal be put to another public vote.
On Thursday, European leaders agreed to delay the UK’s departure from the EU.
PM Theresa May is coming under pressure to quit after saying she might not put her Brexit deal to a third vote by MPs.
Crowds were told the initial count showed more than a million people had turned up – putting it on a par with the biggest march of the century, the Stop the War march in 2003.