Hello Pen,
I remember St Philips OB Club, and the Bell & Pump Folk Club. Back in the late 60's and early 70's we went there most weeks (Saturday night, I think) and saw plenty of performers from that era. Mostly, I have to say, forgotten, especially by me. In fairness, most of them were way too 'folkie' for our taste, but I do recall one band called The Silkie who were great. They had a hit with 'You've Got To Hide Your Love Away', written by Lennon/McCartney. I have a feeling that somewhere we still have their vinyl LP. Otherwise, there was a lot of 'hand over the ear' folkie stuff, nasal harmonies, never-ending introductions followed by never-ending and usually self-penned songs. Still, a good evening out and good beer at the bar, too. I also recall a bearded gent called Les (can't remember his surname) who was a really accomplished blues guitar-player, and who usually gave a couple of numbers between the folkie acts. There was also a trad jazz club at the OB Club, but we only went there occasionally, as it used to get absolutely rammed in there.
Edit: I just remembered another really entertaining folkie band we saw there, these being Brandywine Bridge (as per Tolkien), who are now, I believe, the resident band at Warwick Castle! They've come a long way!
I am sure that there is or was a photo on this Forum of the OB Club in Waterworks Road. If it's been demolished, then I'd be sorry to hear that.
G