Tens of thousands of demonstrators filled central London on Saturday, waving English and British flags at a rally led by anti-immigrant and anti-Islam campaigner Tommy Robinson.
Police have said they will have a huge presence in the British capital.
A "Stand Up to Racism" counter protest also met nearby, following a highly charged summer in Britain that has seen protests over immigration and free speech.
By midday tens of thousands of protesters were packed into streets south of the River Thames, before heading towards Westminster, seat of the UK parliament.
Police said some 110,000 people attended the far-right rally.
