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Was bought "Wild food" by Roger Phillips: http://www.bookdepository.com/book/9781447249962?redirected=true&viewCountry=UK&selectCurrency=GBP&gclid=CIzkp62xysACFVDItAod-xIACA
It gives you some good general tips on foraging but it's not fungi specific and is in no way an identification guide, it's more a recipe book on what to make once you've got the goods.
The Mushroom guide I'm using is Mushrooms and Toadstools by David N Pegler which I bought in oxfam. It's a great bit of work, brilliantly illustrated and with a helpful key to show you where the fungi may be found, what they look like, whether they're deadly poisonous, poisonous, inedible/unpleasant, edible after cooking, edible and excellent. (Doesn't do bracket fungi though.)
There's plenty of decent guides online which I read as well.
^what book did you get?