Large white almost trumpet like shape with very white grooved underside
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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Have you got a size on this one? I think it is likely to be a Clitocybe but it looks too robust for rivulosa which normally grows in short grass.
The size from memory was between 50 and 75mm diameter across the top
At that size I would go for Clitocybe geotropa.
Lat/Lng: 50.7, 0.3
OS grid ref: TV625914