The production company that makes MasterChef has appointed a City law firm to lead the investigation into alleged misconduct by presenter Gregg Wallace.

Wallace, 60, stepped down from the BBC cooking show on Thursday amid accusations he made sexual comments towards staff and celebrity guests on a range of programmes over 17 years.

Banijay UK, the company that makes the programme, on Saturday said it had appointed Lewis Silkin to lead an investigation and called for anyone else…