This lichen was seen on some flat, horizontal limestone that is part of a balustrade facing south and in full sun.
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.
It's not Lecanora muralis, but I can't suggest what else.
I also know these jelly lichens at least a little better than I did two years ago, and I agree with Nigel.
At first I was doubtful that the distorted objects we could see in this photograph were apothecia, but having downloaded the photo and blown it up extra big, I agree they are, though very distorted by the drying.
Lat/Lng: 51.5598, -0.6878
OS grid ref: SU910853