All in grass near the sea, no trees nearby. Sorry there are no pictures of the underside, except for one that had been broken. I don't like pulling them up. The white ones are very large, a few specimens over 10cm. Any ideas on an id?
The first is growing with Bell Heather so the soil must be acidic, but it is actually growing from presumably Pony dung, so hopefully somebody will be able to tell you which Bonnet Caps grow on Pony dung.
Second can only be Bolbitius titubans (or B.vitilinus in older books)
The third isn't that straight forward - I'll jump straight in and say Volvariellagloiocephala but I had a late night last night.