Watchdog presenter Julia Bradbury is to take time off the show while police investigate alleged “suspicious activity” on her Virgin air miles account.

Bradbury – who exposes rogue business and con men on the BBC1 consumer affairs programme – said she had “done nothing wrong” but had requested leave until the matter had been resolved.

The issue came to light after a national newspaper claimed air miles had been added to Bradbury’s frequent flyer account with Virgin Atlantic on several occasions, when they should have been deducted.

The amount of points added was said to be equivalent to over £20,000 worth of flights.

Bradbury said in a statement that she was “very concerned” about the allegations.

“Although I have not been contacted by the police I understand that my Virgin Atlantic account details have been passed over to the authorities as part of an internal fraud investigation at the airline regarding frequent flyer miles.

I understand that my name appears on a list that includes several Virgin passengers with discrepancies in their frequent flyer statements.

I have done nothing wrong and will of course willingly cooperate with any enquiries.”

The BBC said it respected Bradbury’s decision and that she had requested to take leave from work, and had not been suspended.

A spokeswoman for Virgin Atlantic confirmed that some members’ accounts had been closed, and the police were investigating.