If you're looking to learn all of the edible wild growing foods you can find in UK, I'll tell you how I did it. --Books-- -Starter: 1) Food for Free (small version by collins gem) -Next Level: 2) River Cottage: Hedgerow -Ultimate foraging bible: 3) Food for Free - 40th anniversary edition (has elderberries on the cover) -To expand your knowledge of these plants and what uses they have, go to PFAF database website (plants for a future) where you can search thousands of plants. This site is everything you will ever need as an additional and reliable reference. -Be sure to research poisonous plants and the species that it can be mistaken with. --Mushrooms-- -To learn about edible wild growing fungi you can try these books: "Collins gem: Mushrooms" and "Mushrooms and toadstools of Britain and Northern Europe" -It is VERY WISE to learn all of the poisonous fungi first, along with what mushrooms they can be mistaken with. -Some good sites for reference are google.com, rogersmushrooms.com, mushroomexpert.com. -Never pick mushrooms unless you are 100% sure what it is. -In fungi books, read the sections about identification (smell, shape ect). -Only pick mushrooms for food after you have researched advanced mycology books and are able to identify fungi from every characteristic.