Nice quality clips Peter i'd forgotten about Son of a Rotten Gambler not one of the Hollies most well known songs good to see there's a surviving performance of this song thanks for posting.
The flop follow-up to 'The Air That I Breathe' (and the start of a long artistic and commercial decline), this is actually the 2nd TV performance to surface: footage from 'Sez Les' has circulated for years. Part of it is included below.
What if the broadcast they come from now simply needed a video clip and bought it from some licensee? Althought it looks kind of PALish, it doesn't necessarily have to be from Holland at all. It wouln't surprise me for example if they came from West-Germany.