Mine's always been 'move to the Falklands'. Not the sort of thing one can do at the drop of a hat, mind.
Besides that idle thought- there's quite a lot of materiel down there already, so unless the UK withdrew war machines to help in the global annihilation, Argentina would still face some stiff opposition.
More to the point, most of the bad shit to happen after a significant nuclear exchange will hit the Northern hemisphere and wind currents being what they are will mostly keep the fallout up there. Well, here.
I think the Falklands reached a milestone in mine clearance, wherein they believe most of them are dealt with now.
Still, 'most' implies an unnerving possibility of chance.
- ed: I realise, belatedly, that this circles back to the original conceit - staying out of the way of noxious winds :)