Thought I'd come back and update on my webuybooks experience
They rejected two books. 1 for spine damage and the most expensive one (6.58) for 'heavy staining'.
Now - I'm 99.9% certain that it wasn't stained, but I could be wrong. I request that the book is sent back to me.
A week later, it's not here. I contact them, and to be fair to them, they quickly refund the return fee as well as pay the agreed price for the book. Net result = I can't check if their idea of 'heavy staining' is aligned with mine.
If it had been a 15p book, I wouldn't give it so much as a second thought, but call me a cynic... (especially since I sent one trilogy back that I would say was pretty dogeared/very well used, and they accepted that without a murmur).
That, along with some other things (10% welcome offer that I could have SWORN I applied but which wasn't added onto my revised offer) and lack of being able to go back and see details of original offers (only discovered when I had problems and wanted to double check) means I'd be a bit cautious about using the service again - especially if they offer apparently high prices for books. Maybe better to send lots of cheaper ones, that way, if they refuse it's not such a big deal to get them to just recycle.
That said - it's convenient and saved me having to dispose of a load of books/netted me £35 (eventually!!)
Anyway - hope that review helps someone.