Small cupped fungus with scarlet interior.
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 agree with the proviso that you are aware of the discussion at http://www.ispot.org.uk/node/244208
Thanks for the comments and the links.
Lat/Lng: 51.3106, 0.1223
OS grid ref: TQ480589