Growing out of the woodland leaf litter with lots of dead wood around.
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.
The paler outside, ridged inside and time of year make this likely. Did you notice any smell, it should have been "swimming bath" like.
Lat/Lng: 51.3, -2.4
OS grid ref: ST7261