London police are bracing for chaos as thousands of right-wing protesters descend on the city today for a 'Unite the Kingdom' march led by Tommy Robinson.

The Met announced it is deploying 1,600 officers as Robinson supporters and opposing anti-racism demonstrators, who are hosting a 'March Against Fascism', stage rival rallies.

The march organised by anti-immigrant and anti-Muslim activist Robinson, real name Stephen Yaxley-Lennon, met at Stamford Street near London's Waterloo Bridge before making its way to the southern end of Whitehall where a rally will take place.

A counter-protest organised by group Stand Up To Racism is due to gather at the other end of Whitehall, the main thoroughfare towards parliament, later.

Thousands have turned out bedecked in Union Jacks and England flags at the Unite the Kingdom march, which is expected to mourn Charlie Kirk, the American conservative activist shot dead on Wednesday as he gave a talk at a university in Utah.