http://news.bbc.co.uk/2/hi/uk_news/magazine/7967968.stm
Point number 6 says.
6. KEPT IN THE DARK
For a city dweller, used to a constant fog of light, it can be a rare treat to sleep in undisturbed treacly darkness. It's becoming more and more difficult to find. There are light polluted skies outside - and the insides of homes are overflowing with light-emitting gadgets. Kielder in Northumberland is claimed as having the darkest skies left in England.