An estimated half a million people gathered in London for the largest demonstration in UK history against the far right, organisers said.

More than 100 charities, including Muslim representative bodies, campaign groups and trade unions, took part in the Together Alliance march, presenting a broad show of unity against far-right politics.

Large numbers of protesters marched through central London carrying placards reading “No to racism, no to Trump” and “Refugees welcome”, as police lined the route.

Rally co-organiser Kevin Courtney told the crowd the turnout marked a historic moment.

“Our estimate is now that there are half a million people on this demonstration – the biggest demonstration ever against the far right,” he said. “And it gives us all confidence to carry on. Thank you very much.”

Polanski said the march was intended to send a message to figures on the far right.

“There have been dark times, I know people have been scared and we have been afraid, but days like this are here to send a message – a message to Tommy Robinson, to Nigel Farage, to those who appease them,” he said.

While a small number of far-right figures and fringe media outlets attempted to provoke reactions, the demonstration remained largely peaceful.

The Metropolitan Police Service said 25 people were arrested during the day. But eighteen of those were linked to a protest by Palestine Action supporters outside New Scotland Yard. The Met announced recently that it would resume arresting protesters for holding signs in support of the group.

Cultural pushback against far right

Much like the anti-racist mobilisations from the 1980s, when musicians, actors, and writers lent their voices to stem the rise of far right sentiment, the demonstration drew support from a range of public and cultural figures, including Lenny Henry, Steve Coogan, Paloma Faith and UB40.

Organisers said the turnout surpassed the far right rally led by Tommy Robinson last year, which drew around 100,000 people.

That march descended into violence, anti-Muslim and xenophobic rhetoric. The Met had said its officers faced “unacceptable violence” and reinforcements equipped with helmets and riot shields were deployed to maintain control. Marchers were arrested for a range of offences, including affray, violent disorder, assaults and criminal damage.

Here are some of the social media highlights from the Together Alliance event