Series charting the history of the best of British comedy looks at Sorry!, the sitcom starring Ronnie Corbett as a middle-aged librarian who still lived at home with his domineering mother. Corbett's character, Timothy Lumsden, not only tickled the nation's funny bones but also apparently went on to influence a generation of younger comedians such as Frank Skinner and Harry Hill. Interviewees include Ronnie Corbett and writers Peter Vincent and Ian Davidson.