I know all the following occur within 10 minutes walk though I dare say there are many others that I haven't noticed yet.
Plants
Hazel, hawthorn, rowan, sloe, damsons, elder, nettles, sorrel, chickweed, garlic mustard, golden saxifrage, meadowsweet, bramble, raspberry, wood sorrel, pignut, ground elder, heather, bilberry, cleavers, comfrey, yarrow, burdock, dandelion, ramsons,
Fungi
parasol, shaggy parasol, field mushroom, various boletes, puffball, stinkhorn?
Animals
Squirrel, pigeon, brown trout, rabbit (scarce), brown hare (occasionally) and there are crayfish in the river but they are native so out of bounds.
Of course if it was an emergency then the easiest source of meat would be sheep or cow.
Steve