First broadcast 13th November 1971.
The headmaster gives Potter permission to advertise for an assistant.
Deryck Guyler - Norman Potter
Noel Howlett - Mr. Cromwell
Joan Sanderson - Doris Ewell
Richard Davies - Mr. Price
Erik Chitty - Mr. Smith
Richard Warwick - David Ffitchett-Brown
Derek Griffiths - Sidney Noakes
David Howe - Colin Lovelace
Roderick Smith - Philip Larch
Bruce Hodgkins - School pupil
