This is such a good guide to British trees,at that price it's an absolute bargain.( rrp £17.99).What i payed for it when it came out.
Apart form Roger Phillips trees in Britain, i cant think of a better book to id tree's.
I also picked up Collins flower guide for £6.00 (rrp £30).
That's another good book that's in my book shelf for reference,along with so many i have gained over the years.