David Cameron has quit his role at the software company Afiniti after its founder was accused of sexual abuse against a female employee.

A spokesman for the former prime minister said on Wednesday that he was resigning as chairman of the company’s advisory board with immediate effect, and strongly disagreed with Afiniti’s response to the allegations.

It came after Tatiana Spottiswoode, a former employee at the Bermuda-based artificial intelligence company, alleged a pattern of harassment and assault from Zia Chishti, Afiniti’s founder and chief executive.

The US House of Congress has now released pictures allegedly showing the injuries suffered by Ms Spottiswoode.

Ms Spottiswoode told the House that Mr Chishti, 50, had beaten her on a work trip in 2017 when she was 23, leaving her with injuries, and told her that “he should have had sex with me when I was 13 years old”.

Afiniti said that Mr Chishti “strongly disputes all accusations against him” and said that an arbitration decision that she had been sexually harassed and assaulted by Chishti was “erroneous”.