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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If the underneath colour was grey this will be Bjerkandra adusta, which is what it looks like from this photo.
I have agreed with yours Martin and agree with Paradise suggestion shame there are not some clearer photo's.I think I must have had a moment of madness when I put on Silver leaf.
Lat/Lng: 53.6366, -2.8377
OS grid ref: SD447158