Small white granular discs in clusters on a paving stone
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 your photo with this one of Aspicilia contorta:
and this one of Lecanora polytropa (in centre)
you'll see the difference between the two species.
Lat/Lng: 55.9, -3.8
OS grid ref: NS9179