The Strangers:
Robert Urquhart and Thomas Heathcote.
The Family:
Maurice Denham, Anne Pichon, Derek Fowlds, Diana Beevers, and Dane Howell.
The Police:
Peter Lewiston, Peter Noel, Roy Patrick, Norman Mitchell, John Kelland, Michael Wynne, and Ian Fairbairn.
(Source: Radio Times, 1 December 1960, p.17.)