Lionheart mentioned the iPhone compass app in another post.
Well, it does more than your average compass: a further click makes the needle swing over to TRUE North!
With this in mind, I went outside at 12 noon and looked where a stick cast its shadow, expecting it to line up true N-S.
It did not.
Before I start complaining to out local Member of Parliament I thought I'd ask the question of the navigators (astronomers?) here.
I'd have thought the answer is "Yes" but then I also thought the sun rises in the East...