Confidence: It might be this.
Notes: I wouldn't have tried adding an ID, but the postulated ID of Icmadophila ericetorum (blue-grey crust with abundant, quite large, orange-pink, rather rubbery apothecia, growing on damp, peaty, moorland banks) is so totally off-beam that I have to put something to change it. I think it really is Buella aethalea though - evidently tiny, conspicuous black prothallus around each of the small thalli, a lot more blackness that is probably its pioneer stage. Variable, grows on all kinds of substrates, including glass and old oil drums (and stone walls). There was another recent post named Icmadophila ericetorum even though it was nothing like it. Has someone published a joke lichen guide??