A life time fan and Prisonerologist of the 1960's series 'the Prisoner', now a leading authority on the subject.
The most obvious answer is the Rook - perhaps it's a small-scale version of his defence system!Be seeing youZM72
Hello ZM72, Bingo! We are both on the same wavelength. You hit the nail on the head, 10 out of 10.Very best regardsDavidBCNU