Comment by matsemann
And in Norway we often don't see the sun during certain months, due to it only being up for a few hours in the middle of the day (when we're working). And even if I was outside I would be covered in clothes.
We have a saying here to take cod liver oil all months ending with R (in Norwegian that's September to Februar) to get both omega 3 and the vitamin D.
Indeed, I was going to add that Scotland isn't really that far North (or indeed South) so there will be lots of places where the problem is far worse!