Our ring of mushrooms is back again in the field. Have dipped into the excellent River Cottage Mushrooms Handbook No 1 by John Wright to reference. Am fairly certain they are Fairy Ring Champignon (Marasmius oreades) which my trusty books tells me we can cook to eat or pickle the caps in oil. Readers of the blog won’t be surprised to hear that I’ll give the pickling ago. Watch this space!
p.s. John’s book also says beware of the Fool’s Funnel which grows in similar habitats, but it has a frosted cake like bloom on the cap.