About 90 mm in height
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.
I didn't notice the surrounding trees but the following day I found a Fly Agaric in the same spot:
Perhaps giving some support for the Birch Webcap suggestion?
It hasn't come across very well in the photo but the cap was quite orange in daylight.
Lat/Lng: 51.1, -0.2
OS grid ref: TQ2636