A flat lilac coloured crust with a darker knobbly centre and spreading out to a paler fringe around the edge.
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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Many thanks Fenwickfield, that does look good for it! I'll try to refind the specimen and check as you suggest - but I think you have cracked it!
Kind regards, Martin
Lat/Lng: 51.6206, -0.504
OS grid ref: TQ036923