Blue-grey,slightly ridged foliose lichen, though difficult to decide between H physodes and H tubulosa
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.
Looks right for Hypogymnia and there's Physcia tenella in the top two photo's as well.
Lat/Lng: 54.5, -6.0
OS grid ref: NW4424