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.
The only possible confusion would be with O. androgyna, the chemical reactions and disc colour are the same but O. androgyna has yellowish soralia.
I think I can see scattered soredia in your large photo at full size which would suggest O. androgyna but you'll need to check your specimen to be certain.
We revisited the site and can see yellow soralia so am agreeing it must be Ochrolechia androgyna.
Wildlife of Assynt
Lat/Lng: 58.1, -5.2
OS grid ref: NC1626