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One of the Parasols. Do you have a photo of the stem? That would help with the identification.
Shaggy Parasol has a stem that is "whitish tinged dirty pinkish-brown, bruising red-brown when fresh".
Parasol has one "white, with grey-brown felty covering which splits into snake-like markings as the stem expands".
There are other related species, but these are the most likely.
Want to have a go at adding an identification?
Lat/Lng: 51.7538, -1.2984
OS grid ref: SP485063