We are only 7km from one of the primary staging areas for the NATO fleet ?which use to be mobilised for the chance of the Russian fleet steaming down past Iceland into the Atlantic and North Sea.
So, in the old cold war scenario, we are toast.
Burnt toast.
Radioactively so.
Now take the Fallout scenario where Europe didn't get bombed, but basically just went to pieces, with minimal nuclear exchange (lore is vague on this..) With the idea that society just crumbles that would entail communities having to fend for themselves, in which case living on an island isn't too bad.
Water levels rise, but then they fall as well ?read it somewhere doing research for a fanfic.
We also have a major royal Dutch marine training facility here on the island. Instant personal armed forces.