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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This is probably Pleurotus cornucopiae it can be identified by the ridges runing down the stipe (which you managed to hide in your photo;))
No sooner said than done........! Are those ridges good enough!?
I think the reticulations are not enough to be P cornucopiae and it is likley to be P pulmonarius the Pale Oyster which has a smaller fruit body than the others.
Can't wait for my copy of Collins Guide to arrive!!
And then the Phillips and Jordan Encyclopedias and Breitenbach/Kranzlin Fungi of Switzerland and Funga Nordica and Bon and Flora Agaricina Neerlandica and ...........;)
... madness but we like it :-D hee heee ha ha
Lat/Lng: 51.0492, -0.7113
OS grid ref: SU904285