Rishi Sunak has said he does not know the identity of the BBC presenter who allegedly paid a teenager for explicit images, but he has been assured the claims will be investigated “swiftly and rigorously”.The Prime Minister’s comments came ahead of the allegations about the unnamed star being put to the head of the corporation.The BBC has suspended a male member of staff after The Sun newspaper reported that he paid a young person around £35,000 over three years, from the age of 17, for explicit images.