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 photograph needs to be in focus.
Yes it's a lichen and yes it appears to be foliose, but I don't think the ID can be taken any further.
You really need good clear close up shots as these are very difficult to identify and the smallest detail's is needed to give an ID.
Lat/Lng: 51.5477, -0.5469
OS grid ref: TQ008842