Hi Kim - glad to help.
Suggest the best investment is in one of the pocket guides to plants that will lead you to identify the edibles - wild garlic of course, alexander (use like celery), the various herbs and fruits etc.
You may also like the info at
http://www.wildfood.org.uk from Fergus the Forager - been on tv a bit about the foraging life - last appearence was on the London restaurant prog looking for 'food from the tube lines'.
He also does courses so if you are near enough may be a nice day to see what he has to say.
Also would say if you are in the deep south of England, get to River Cottage and have a chat with Hugh F-W (at Bridport) as they occasionaly have wild food courses too. Book online at
http://www.rivercottage.net Bit expensive but very good entertainment. Next ones are mushrooms, and also eating the coastline. You get fed and waterd at the HQ plus all transport and a copy of the cook wild book too in the price.
And no picking the dead flies off the car bonnet as a mid-morning snack then..........?