I was in the Oxfam shop on Mutley Plain in Plymouth today and they had a few railway books in stock. All pretty modern and nothing very special (from my point of view). I picked up a "Then and Now" book on the Conwy Valley Line (Blaenau Ffestiniog), new at ^17.95, Oxfam at ^12.99. I left it there.
Looking over at the Devon interest books, I saw an old book with the letters G.W.R. on the spine. Glorious Devon, second edition from 1929. Not brilliant condition, but not bad either.
I think it was worth ^2.99.
Not bad -^21.50 on eBay with a broken spine!