- Writer:
- Michael Frayn
- Incidental music:
- Wilfred Josephs
- Designer:
- Tony Abbott
- Producer:
- Graeme McDonald
- Director:
- Claude Whatham
- Jamie:
- Anton Rodgers
- Lois:
- Caroline Mortimer
- Ian:
- Dinsdale Landen
- Poppa:
- Felicity Gibson
- The twins:
- Gareth Glynn
- The twins:
- Meredith Glynn
- Tommy:
- Norman Mitchell
- Dibs:
- Pamela Buckley
- Michael:
- Brian Longstaff
- Pip:
- Alan Paxford
- Jack:
- Ian Price
- Ziz:
- Claire James
- Jimpy:
- Reg Whitehead
- Ginnie:
- Shirley Dynevor
- Confidential man:
- Robert Hamilton
- Ingratiating man:
- Iain Reid
- Jane:
- Jane Enshawe
- Postman:
- John Scott Martin
- Mrs. Hammond:
- Sheila Beckett