Brent Central MP Dawn Butler has sparked another social media storm after claiming a black Tory MP prefers the company of white people.

The Labour politician made the claim about Spelthorne MP Kwasi Kwarteng while arguing that the Conservatives were “window dressing” by selecting ethnic minorities to safe seats on Saturday.

Mr Kwarteng unsuccessfully ran as Conservative candidate for Brent East in 2005 before being elected to represent Spelthorne in 2010.

Just one day later, it was claimed she wrote to House of Commons Speaker, John Bercow, accusing deputy speaker Elaine Laing of “unconscious racial bias”.

Speaking at a Fabian Society conference in central London, Ms Butler said: “The Tories are making a conscious effort to put women or African-Caribbean and Asian people into safe seats so they get represented [but] they don’t represent those people in Parliament.”

She then added: “There’s one black Tory MP in particular. I won’t mention his name. Ok, Kwasi... really doesn’t like talking to black people in case somebody realises he is black.

“He’s 6ft 4in, for God’s sake... The Tories are window dressing and we have got to make sure we are the party leading the way.”

The controversial accusations come within a week of a stinging assessment of David Cameron on Twitter, in which she claimed he was “sh***ing all over the working class”.

Yesterday, The Sunday Times wrote that Ms Butler has demanded an investigation into how deputy speaker Ms Laing chooses which MPs are to give speeches in the chamber.

Ms Butler said after waiting for four hours to be called, she asked Ms Laing for when her turn would come only to be told that she had been taken off the list entirely, it was said.

It is said Ms Butler now avoids the Commons chamber when Ms Laing is acting as Speaker.

The allegation comes after Ms Laing criticised Hampstead and Kilburn MP Tulip Siddiq for leaving the chamber too soon after making a speech.

A Labour advisor told The Sunday Times: “Is there an unconscious bias? We need reassurance there isn’t. We are asking the Speaker to look at it and convince us.”