It's a nice mock but the giveaway is the music being too loud in the mix.
Could you link it please?
No, it is identical to this (just with less saxophone and more synth):
I'm not quite sure what you are listening to but it's not even close. I agree with Inspector Sands, this is the original theme from the 80's
I think that's the only episode from the first series that exists on its original tape. In fact I don't think many survive as masters from the first 3 series at all. Though most of them do as off-airs that Bob made himself. Challenge have shown all 26 from series 4 though (even though Wikipedia claims 3 are missing), so they exist.