Top Gear host Chris Evans is facing a police investigation over allegations he flashed and grabbed the breasts of a female colleague in the 1990s, it was confirmed today.

The Met Police issued a statement that there is an ongoing investigation into the TV presenter, after an allegation of a non-recent sexual-assault was made against him.

The allegation was made six days before the latest series of Top Gear made its debut.

It is not known if the Top Gear presenter will be questioned and no information has been given out about the time scale of the investigation.

Evans has previously denied the claims, calling them a “witch hunt”.

A police spokeswoman said: “An allegation of non-recent sexual assault was made to police on May 23.

"The allegation was made by a woman against a man, and relates to incidents in Tower Hamlets in the 1990s.

“There have been no arrests and no person has been interviewed under caution.”

It was reported in May that the tv and radio presenter had allegedly repeatedly exposed himself to a former colleague and grabbed her breasts.

A BBC spokeswoman said they would not comment on the investigation and a representative of Chris Evans also refused to comment.

Yesterday's finale of his new series of Top Gear slumped in the ratings, drawing a record low audience of fewer than two million viewers.

The BBC declined to comment on the audience figures.

The show, presented by Chris Evans and Matt LeBlanc, lost out to ITV's coverage of Euro 2016.