Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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I think this white mushroom could be the fatally poisonous Destroying Angel Amanita Virosa, or the harmless Stubble Rosegill Volvariella gloiocephala. The latter has a "satiny white" stem with a sack-like volva at the base whereas the Amanita has fibrous often slightly curved stem also with a large, sack-like volva which is often buried in the soil. But both of these have smooth caps whereas that of the mushroom here seems to have fine scales or hairs on it. Which brings me to Agaricus, such as A. arvensis or A. campestris. I think I'll plump for some sort of Agaric and, in the light of the lurking Amanita ID, take this as a lesson in being VERY careful before popping a succulent button mushroom in the pan!
Lat/Lng: 51.3845, -0.1545
OS grid ref: TQ285666