Kenneth Connor as Mr. Gregory Adams

Charles Hawtrey as Mr. Michael Bean

Leslie Phillips as Mr. Alistair Grigg

Joan Sims as Miss Sarah Allcock

Kenneth Williams as Mr. Edwin Milton

Hattie Jacques as Miss Grace Short

Rosalind Knight as Miss Felicity Wheeler

Cyril Chamberlain as Alf Hodgson

Ted Ray as Mr. William "Wakie" Wakefield

George Howell as Billy Haig

Diana Beevers as Penny Lee

Jacqueline Lewis as Pat Gordon

Roy Hines as Harry Bird

Carol White as Sheila Dale

Richard O'Sullivan as Robin Stevens

Francesca Annis as Schoolgirl (uncredited)

Lorna Henderson as Pianiste (uncredited)

Diane Langton as Schoolgirl (uncredited)

Jane White as Irene Ambrose

Paul Cole as John Atkins

Larry Dann as Student

Joyce Adams as Parent (uncredited)

Laurence Archer as Parent (uncredited)

Julia Atkinson as Student (uncredited)

Josephine Bailey as Student (uncredited)

Michael Barnes as Student (uncredited)

David Barry as Student (uncredited)

Alan Beaton as Teacher (uncredited)

Paul Beradi as Parent (uncredited)

Ernest Blyth as Parent (uncredited)

Sandra Bryant as Student (uncredited)

Jeremy Bulloch as Student (uncredited)

Nigel Bulloch as Student (uncredited)

Stephanie Bulloch as Student (uncredited)

Anne Chapman as Student (uncredited)

Peter Cleall as Student (uncredited)

Alan Coleshill as Student (uncredited)

Terry Cooke as Student (uncredited)

Leonard Davey as Student (uncredited)

Keith David as Student (uncredited)

Barry Delaney as Parent (uncredited)

Harry Drew as Parent (uncredited)

Jennifer Edwards as Student (uncredited)

Jane Evans as Student (uncredited)

Roy Everson as Parent / Teacher (uncredited)

Daphne Foreman as Student (uncredited)

Irene French as Monica (uncredited)

Patricia Garwood as Student (uncredited)

Kenneth Gouge as Student (uncredited)

Alex Graham as Parent (uncredited)

Richard Greenford as Student (uncredited)

Victoria Harrington as Student (uncredited)

Linda Hayne as Student (uncredited)

Jack Hetherington as Teacher (uncredited)

Ian Hobbs as Student (uncredited)

George Holdcroft as Parent (uncredited)

Shirley Ladd as Student (uncredited)

Ted 'Kid' Lewis as Chauffeur (uncredited)

Theresa Maynard as Student (uncredited)

John Payne as Teacher (uncredited)

Lionel Pope as Parent (uncredited)

Ian Selby as Parent (uncredited)

John Smart as Parent (uncredited)

Barrie Smith as Student (uncredited)

Peter Soule as Student (uncredited)

Pat Symons as Parent (uncredited)

Kit Terrington as Student (uncredited)

David Tilley as Student (uncredited)

James Ure as Parent (uncredited)

Pearl Walters as Parent (uncredited)

Mary Weekes as Student (uncredited)

Joey White as Student (uncredited)

Ross Yeo as Student (uncredited)