Last week I ordered a couple of books from Amazon, both from the 'Collins Gem' series:

• Wild Flowers by Martin Walters
• Food For Free by Richard Mabey.

They are both small pocket sized books which will be ideal to take with you on walks in the countryside. One useful feature of the wildflowers book is a flower-type index where different flower shapes are listed alongside different flower families. It's a useful aid to identification. So far it has helped me to identify Wild Mustard (which was part of the Edible Leaves and Shoots mixture from Garden Organic) and Petty Spurge and two kinds of Willowherb (which grow as weeds).

The Food for Free book covers similar ground to the Edible Hedgerow book I bought from River Cottage. The book contains more plants but with less detail and should be useful to help locate and identify unusual things to eat.