He will be asked why he employed Neil Wallis, the former deputy editor of the News of the World who was arrested last week, as a media adviser. Sources have told The Sunday Telegraph that Sir Paul’s job as Britain’s most senior police officer is now under threat and his performance at the committee could be the deciding factor in whether he survives. Last night, Boris Johnson, the Mayor of London, and Theresa May, the Home Secretary, offered him only lukewarm support.