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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It is really important to show or give measurements as photo's can be deceptive. I am not saying it is not but would be much happier agreeing if I could see the size for myself.
...in this case I think the leaves and flower buds give the approximate scale - I can't see this being much less than l0 cm across.
But yes, a mention of the diameter would make it unambiguous. :o)
Sorry about the size, yes it was a good 30 cms plus, the largest of a small troop of these beauties....
Lat/Lng: 51.2414, -1.0567
OS grid ref: SU659495