Gregg Wallace has responded to mounting allegations against him in a defiant video posted online, saying the accusations come from “middle-class women of a certain age”.

Wallace has stepped back from presenting the BBC cooking show MasterChef after accusations he made sexual comments towards staff and celebrity guests on a range of programmes over 17 years.

In a video posted on his Instagram before 7am on Sunday morning, Wallace says he has worked with more than 4,000…