This was the era of the early police procedural -- 'Car 54 Where You?", "Z Cars", and so on. These were mild by today's standards, which is why The Gold Robbers stands out -- a violent, bleak drama with a downbeat, unresolved ending. To my knowledge it was never repeated and is unlikely to be, given that it is B&W. Notable early appearance of Peter Vaughan, whose career continues today.