On a rock by a road
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.
If you compare these photo's showing isidia (small 'knobbly' bits without discs) in the centre of the thallus with the photo's in your other post that show apothecia (jam tart-like fruiting bodies) you'll see the difference
Lat/Lng: 52.2, -3.4
OS grid ref: SO0560