hmm, shetlands, too ? Well, they are about at the same N latitude as Sweden.
I wonder why Norway and Denmark didnīt have Problems... Found a solar Radio
burst on
https://twitter.com/thesuntoday , but donīt know if it is relevant
Re procedural control: canīt really remember having flown that for real during the last decades. So, no real practice - and I donīt think that todays traffic could be handled procedurally.....in London, Frankfurt, Stockholm...
best