Cortinarius possibly c. purpureus
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Any idea why surprise?
"The pale colour of both cap and stem lead you to expect the gills to be pallid. Not so! The gills are blood red - hence the rather fanciful common name given recently to this species."
Certificate in Contemporary Science (Open)
Beat me to it but thats what I would have said.
Lat/Lng: 51.0868, -0.140378
OS grid ref: TQ303335