yes, I had someone from Southern Electric (or one of the others - they're all the same to me)

They have an interesting ruse: "Hi! I'm your local area manager (etc.)"
So you think: "Ooh! Area Manager. They must really care"

But if you look carefully at the identification (which I am sure is genuine) it shows that it expires in around a week. These guys get 'appointed' area managers long enough to do the door-to-door stuff. Neat trick!

Nothing from Sky (yet)