If ClasAir do regain their AOC, part of the process to operate will be to demonstrate to their FOI that they are competent.
This will no doubt include a flight to Islay, and they are likely to become a CAA approved operator at ILY.
Loganair and others operate at ILY as an approved CAA [SRG] operator. They do not own the IFR procedures. An intangible asset.
bogof