Hi again Mike,
I am now at home, looking at your photographs with a better monitor and able to check a couple of books.
I think now that your
Candelariella IS
C. coralliza.
Candelariella coralliza (images of British lichens)
Compare:
Irish lichens - Candelariella vitellina.
It is not the same.
C. coralliza does, rarely, have apothecia (they are even shown in 'Dobson') and the more or less spherical granules cover the entire surface. Even the fragments of young thallus are seen in your photograph to be granules, whereas
C. vitellina starts out with aggregations of flattened, tiny plates.
C. vitellina is very variable (maybe troubling so) but this would have to be VERY well developed. Even on the side of the wall, I think it has to be
C. coralliza.
Alan