Yes I enjoy foraging too. I hope the lane you picked the wild garlic from wasn't too polluted (e.g. by cars)!?
Elderberries are my favourite - I have a great recipe for Elderberry "Rob" .... a kind of cordial, that keeps (you dilute it).
Have made elderflower champagne (trad. recipe). Nettles and chickweed are good (and plentiful). Chickweed grows freely and quite commonly found; rich in vits and mins - nice taste e.g. in salads. Young dandelion leaves are very good for the liver.
You're probably familiar with "Food for free" by Richard Mabey? It's a classic forager's bible - probably published in late 1970's. I guess there are other books, more modern around too. Mabey's book goes into sections, eg. roots, leaves, flowers, terrains where they can be found, descriptions and illustrations.