The BBC has been accused of ignoring allegations that Chris Evans, the corporation’s highest paid star, repeatedly exposed himself to a female colleague while working for Channel 4.

Details of the alleged sustained sexual harassment, which took place during the 1990s when Evans was working on The Big Breakfast, were spelled out in an email to Lord Hall, the BBC’s director general.

Details of the woman’s allegations were published in the Sun. Police dropped the allegation due to insufficient evidence.

The woman said Evans “would walk in naked following his morning ritual of taking a bath and would sometimes touch himself.

"On one occasion, he grabbed my breasts,” she reportedly said.