| Jimmy Edwards |
Professor James Edwards (Headmaster) |
| Arthur Howard |
Oliver Pettigrew (Assistant Headmaster) (Series 1-7) |
| Kenneth Cope |
F. D. Price-Whittaker (English Literature) (Series 1) |
| John Garside |
G.D. St J Dinwiddie (Latin and Greek) (Series 1) |
| Arthur Bush |
L.B. Hackett (Higher Mathematics) (Series 1) |
| Tony Sympson |
R.D. Spelthorne (Lower Mathematics) (Series 1-2) |
| Norman Bird |
S.A. Smallpiece (Geography) (Series 1) |
| Victor Baring |
M. Aristide Beaumarie (Modern Languages) (Series 1-2) |
| Barbara Archer |
Matron (Series 1) |
| John Hall |
Taplow, Jnr (Series 2 & 6) |
| Julian Orchard |
Oliver Pettigrew (Assistant Headmaster) (Series 8) |
| Liz Fraser (as Elizabeth Fraser) |
School Matron (Series 2) |
| John Stirling |
Lumley (Series 2-3) |
| Philip Howard |
L. J. Sneath (Carpentry) (Series 2) |
| John Scott |
G. Hackworth-Webb (History) (Series 2) |
| Peter Glaze |
R.P. Trench M.A. (Series 3) |
| David Langford |
Parker (Series 3) |
| Edwin Apps |
L.J. Halliforth, B.Sc (Series 3-7) |
| Michael Stainton |
G. Perkins (Series 3) |
| John Lewis |
R. Palmer (History) (Series 3) |
| Robert O'Leary |
Phipps (Series 4) |
| Jimmy Ray |
Crombie (Series 4-5) |
| Derek Needs |
Phillpott (Series 4) |
| Geoffrey Paget |
Rawlinson (Series 4-6) |
| Frank Raymond |
Mr Cope-Willoughby (Series 4 & 6-7) |
| Mary Hignett |
Mrs Mortlake (Series 4) |
| Brian Rawlinson |
Mr Proctor (Series 5-6) |
| Paul Norman |
Potter (Series 5) |
| Gordon Phillott |
Mr Dinwiddie (Series 5-7) |
| Stephen Portch |
Hoyle (Series 6) |
| Keith Smith |
Mr Forbes (Series 7) |
| Peter Greene |
L.J. Halliforth, B.Sc (Series 8) |
| Harold Bennett |
Mr Dinwiddie (Series 8) |
| Gary Warren |
Taplow, Jnr (Series 8) |
| Greg Smith |
Potter (Series 8) |