They were marked up at £25 and £10 respectively, and I passed on those, instead acquiring a £3 booklet on the 3rd World Students' Chess Championship in Uppsala in 1956 (possibly more on that later).
My question is whether the books were priced reasonably?
(i) 'Catastrophe in the Opening' by Iakov Neishtadt (Pergamon International Library edition, translation by Kenneth P. Neat, 1980) - £25
(ii) 'Bishop Endings' by Yuri Averbakh (Batsford translation, 1977) - £10
Charity shops would have priced them lower, I think.
The rest of the pile of 20-30 books were all opening theory publications, which held zero interest for me. Well, a few books about the Bobby Fischer match as well. And some newspaper clippings inside the books, which made me think they might have been from a house clearance of a recently deceased chess player in the area. Which is a bit of a morbid thought.
Anyway, would you pay £25 for a secondhand chess book? I don't think it is even particularly rare.