Anti-Trump protesters are starting to arrive in London to demonstrate against the US President with up to 250,000 people expected to turn up to their 'carnival of resistance'. The activists are heading to to the centre of the capital for a rally that will also feature a speech by Jeremy Corbyn, who snubbed last night's state banquet at Buckingham Palace. Two groups – Stand Up To Trump and Stop Trump – are co-ordinating protest groups and Mayor Sadiq Khan has agreed to let agitators lampoon Mr Trump with a 20ft baby blimp and the other as a robot on a gold toilet. They have laid on coaches to bring thousands of supporters to the capital, and claim up to a quarter of a million people will march from Trafalgar Square to Parliament Square. However, a protest outside Buckingham Palace promising to 'wreck' a royal banquet in Mr Trump’s honour last night was a damp squib and attracted only about 300 supporters. A shirtless protester clutching a 'Dump Trump' placard stands on a 20ft robot showing the US President on a golden toilet in Trafalgar Square today, where up to 250,000 people will gather Anti-Trump protesters gathered outside Buckingham Palace but despite a promise to 'wreck' the state banquet only around 300 people turned up Today the police have closed off roads all over central London again as Trump visits St James' Palace and Downing Street Today a coalition of hard-Left activists and campaigners are preparing to paralyse part of central London in protest at the US President’s visit. Organisers said the rally could be ‘the biggest demonstration in British history’, despite the Iraq war protest in London in 2003 attracting more than a million people. Scotland Yard has put areas surrounding Buckingham Palace and Downing Street on ‘lockdown’ – with 10,000 officers deployed in a £25 million security operation – and has asked for reinforcements from other forces for the three-day visit. Metropolitan Police Commissioner Cressida Dick last night said her officers will be ‘firm’ with those who break the law after a climate change protest in London early this year got out of control, Activists have been given permission to protest today in Whitehall, just yards from Downing Street, while Mr Trump and Theresa May hold meetings with officials. They will chant ‘Donald Trump’s not welcome here’, to a cacophony of noise from drums, gongs and whistles. Organisers are planning to erect a stage in the street where various anti-Trump speakers will address the crowds. As well as Mr Corbyn, the rally will be attended by a string of Labour shadow ministers, including Emily Thornberry, Diane Abbott and Dawn Butler. Demonstrators will be blocked from walking the entire length of Whitehall for security reasons. It means they will have to walk a circuitous route via Embankment if they want to reach Parliament Square, where a 20ft blimp depicting the President as an angry baby will be flown. Organisers have been given permission to fly it by the London Mayor’s office and the Met Police. A 16ft talking robot depicting Mr Trump sitting on a gold toilet, which has been shipped in from China, is also expected to make an appearance. There will also be ‘milkshaking’, during which protesters will bombard figures of Mr Trump, Nigel Farage and Boris Johnson with milkshakes. Organiser Shabbir Lakha said: ‘We would like this to be the biggest demonstration in British history.’ Mr Lakha added that the plan was to fill Trafalgar Square, Whitehall and Embankment – ‘effectively surrounding’ the areas where Mr Trump will be visiting. ‘We are going to be assembling in Trafalgar Square and will march down Whitehall, with a rally at the Monument to the Women of World War II next to the Cenotaph, which should be at the same time Donald Trump is in Downing Street.’ Among those taking part will be environmental activists, anti-racism campaigners and women’s rights protesters. Hundreds of teenagers involved in the recent youth strikes against climate change are also expected to attend. Mr Trump appeared unconcerned by the protest plans, writing on Twitter last night: ‘The relationship with the United Kingdom is very strong. Tremendous crowds of well-wishers and people that love our country. Haven’t seen any protests yet, but I’m sure the Fake News will be working hard to find them.’ Miss Dick said police were expecting fewer protesters than took to the streets for Mr Trump’s visit to Britain last year, when the figure was put at close to 250,000. She added: ‘We will be pretty firm if protesters are intending to try to protest in a way which is unlawful, and very, very firm if anybody wants to do anything which might in any way endanger security. ‘We take our role really seriously – on the one hand to keep safe the visiting head of state and their entourage and everybody connected with it, and of course our own Royal Family, and on the other hand in a liberal democracy like ours to ensure that if people wish to protest lawfully they can do so without crime, and do so safely.’ John Apter, chairman of the Police Federation, said: ‘There are not enough officers to meet the day-to-day pressures on policing, so this on top is a huge ask.’ All rights reserved for this news site dailymail and under his responsibility