Police in London on Saturday braced themselves as tens of thousands of protesters joined the latest rally staged by far-right activist Tommy Robinson.

Robinson, whose real name is Stephen Yaxley-Lennon gathered up to 150,000 people into central London last September, for a rally proclaiming "national unity, free speech and Christian values."Who is Tommy Robinson?

The public profile of the former football hooligan turned anti-Islam activist has risen significantly in the UK in recent years. He also has convictions for assault, stalking and other offenses.

Robinson urged supporters this week to act peacefully in what he billed as "the greatest patriotic display the world has ever seen."

London's Metropolitan Police has said it will deploy 4,000 officers. They will be assisted by horses, dogs, drones and helicopters.