On Alder Buckthorn in deep shade.
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.
Thanks for the pointers to the species and I agree with your diagnosis, having checked in the Illustrated Guide.
Lat/Lng: 51.3093, -0.1754
OS grid ref: TQ272582