“Whilst these complainants have not raised the allegations directly with our show producers or parent company Banijay UK, we feel that it is appropriate to conduct an immediate, external review to fully and impartially investigate,” it continued.

“While this review is under way, Gregg Wallace will be stepping away from his role on MasterChef and is committed to fully co-operating throughout the process.

“Banijay UK’s duty of care to staff is always a priority and our expectations regarding behaviour are made clear to both cast and crew on all productions, with multiple ways of raising concerns, including anonymously, clearly promoted on set.

“Whilst these are historical allegations, incidences brought to our attention where these expectations are not met, are thoroughly investigated and addressed appropriately.”

The statement added: “If anyone would like to talk to us or raise any issues or concerns, then they can contact speakupbanijayuk.com in confidence.”

A BBC spokesman said: “We take any issues that are raised with us seriously and we have robust processes in place to deal with them.

“We are always clear that any behaviour which falls below the standards expected by the BBC will not be tolerated.

“Where an individual is contracted directly by an external production company we share any complaints or concerns with that company and we will always support them when addressing them.”