Thank you guys for all the suggestions and comments - sorry I've only just got round to responding, been a bit Uncle ****.
So, as I surmised, I'm not alone. #1 Wife and I have been discussing it this evening, and we agree on two main points, both of which have been mentioned by respondents.
1. The most important objective is that the recipient takes everything, for obvious reasons. With everything else she will have to attend to after my demise, messing about in a crammed dusty workshop won't be high on the list, and I want to avoid unnecessary stress at all costs.
2. I am not worried about getting a fair price. (See 1 above) Naturally I would prefer that a charity or college/school would take it all, but that's most unlikely - they just don't have the resources. I like the idea that (part of) the value could be gifted to charity, as it would be my final charitable act, but as a last resort I accept that it may have to be a commercial operation that takes it. Maybe they would consider donating a part of their profit.
I hope we can keep this thread open for a while yet; all the responses to date have been helpful, but I think there is more good advice out there. please keep it coming.