It's a shame they never released the full series on DVD (or blu-ray). Most of it is available if you consult a chart of all the releases, but they've been cut and rearranged to fit on discs, and the soundtrack is as you say. I imagine they didn't due to problems like this at the time, but after the scandal and with how much time has passed, they'll never actually bother, unless someone straight up steals/copies the broadcast tapes from the archives and do us all a favour.

I think it’s true for a lot of BBC shows, many had great music, but the BBC also ran hugely popular radio stations and i think it was through that they were able to license a large amount of music.