During Checkmate, as No.6 together with the Rook approach No.42 who is busy painting the wall of an arch, you can hear, quite distinctly someone shout out "You alright there Fred?" "Yes" Fred repiles. So whose voices are they? Extras involved with the production? Production members? Or guests staying at Portmeirion in September 1966 when the Prisoner was being filmed? Whoever it was, they certainly put their own individual mark on that particular episode!