Trying to donate books

[Boedatives]

21 large boxes full. Some v new, some older but basically all literary classics.
So far, local hospixe has said they will charge £500 to come and collect (it's a 2 hour round trip for them).
What else can I do with them?
(I have a condition whereby I'm advised not to lift over 15kg as well so makes it tricky)

I think it is so difficult to just throw books away because we have been brought up to value them. It is true, as someone said upthread, that it is the words that matter, not the physical form they are in at the moment. So a book doesn't go into oblivion if you throw it away - there will be another copy of it somewhere. So if I find a book is on kindle, or in the Internet Archive of books, I have fewer qualms about throwing it away. I believe every book published was required by law to send a copy to the British Library, anyway? Though I don't know when that law came into force.

The National Trist bookshops near me are always begging for donations

Oh, what a nuisance. Maybe they find books difficult to shift in the charity shop and don't have the storage space for that many of them.