Pretty much every commercial pilot is ILS rated... but it depends on the airline if they are okay with landing in fog or with extra expense flying all the way back and providing a hotel;)
I'd expect a Scandinavian airline to be prepared for bad weather; rain, fog, and snow are completely common occurrences in all major Nordic airports, can't see why nor how SAS would be able to operate without pilots being well-trained on flying in bad conditions.