Dr Knock, full cast:
Back row (left-to-right): R. A. O'Leary (prompt); Robert
Hoffman (?); John Walker; Richard Hayward; David Pearce; David Tidd;
Stanley Mason; Richard Phillips (?); John Cobley; John George; and Martin
Streeter (?)
Front row (left-to-right): John Turner (?); Geoffrey Nicholson (?); Geoffrey Boyce; and Peter Goulding.