Growing in the allotments.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Yep. Agaricus bisporus. The situation of the ring on the stem and the manner of the ring (double) are good characteristics as well the habitat.
Lat/Lng: 52.83013, -1.24997
OS grid ref: SK506261