Don't know what this is at all.
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 looked. I don't know much about fungi, but this one was so striking I rather wanted to know what it it was. I looked up Pachyella violaceonigra on the web, and there were some specimens that lookd very similar. Could be that they're mis-identified on those sites - I've been caught out like that before. But as I say, I'm speaking from a position of ignorance.
The web is a fantastic place but as well as perfect examples of many fungi there are also either non-representative (if we are being generous) or completely wrong identifications out there as well.
Pachyella is an Ascomycete much more like a peziza and has little or no stem which grows on soil. Polyporus all grow on wood.
Lat/Lng: 52.08925, 0.05532
OS grid ref: TL409454