The Fenn Street Gang 1971 "Please Sir!" film), David Barry, Peter Denyer and Liz Gebhardt. Leon Vitali replaced Malcolm McFee as Peter Craven during the first series, although Malcolm took this role back for the second and third series. Peter Denyer (Dennis Dunstable) and Liz Gebhardt (Maureen Bullock) were absent from the third (and final) series. John Alderton (Mr Hedges, their form-master when they starred in "Please Sir!") guest-appeared in 3 episodes of the first series of "The Fenn Street Gang" and the first two episodes from the final series of "Please Sir!", which ran alongside "The Fenn Street Gang" in transmission dates. Richard
Deryck Guyler Rat, Potter would often complain to John Alderton, who played the part of schoolteacher Mr Hedges, about class '5C' and their 'dreadful behaviour'. Other television appearances include those in "That's My Boy", a comedy series starring Mollie Sugden and Christopher Blake, and the short-lived political comedy "Best of Enemies". He also played a drunken surgeon in the film "Carry On Doctor". During the 1980s he voiced an animated skeleton in UK adverts for Scotch Video Tapes. He was the narrator of the BBC documentary about Fred Dibnah - "Fred Dibnah, Steeplejack" Guyler had been a devotee of washboard playing since