Thanks, all of you - the problem is, of course, that I have multiple copies of the same titles, and however interested groups and residential homes might be they're unlikely to want more than one of each. Yes, I am in Wales but there aren't any specific "Welsh Culture" societies that I'm aware of, and the same problem applies.
I'm not bothered about the money at this stage - more concerned that we're moving stuff from house to house and it's pretty pointless. I have loads of CDs, but they at least do sell, from time to time!

And, by the way, if you're in the UK and have lots of CDs (especially small labels, such as most folkies record for) try Music Magpie to sell them. Sadly they don't accept tapes - but even if they did they wouldn't take multiple copies!