Also, In Norway at least, Silverstone is a much better marketing term than the other venues.
Regarding this "boycott", I think the Nordic teams are simply out of the loop compared to the "German cluster". For most teams it does not really matter either if the competitiveness isn't the highest, since a top 5/10/x finish will still be considered a good result.
Revolve NTNU should on paper be hard to beat, since they are using the default "OP" electric car concept. They have a history of both botching endurance in weird ways and receiving magic penalties in UK, so you never now.