Kelling Heath in North Norfolk was on the One Show a few months ago, as being one of the places in the country with the lowest amount of light pollution.
We stayed there for a week in April and had a great time. Admittedly, the stars didn't look that much clearer than several other campsites I've been to, but I'm no expert.
------------- 'In later life, you will be more disappointed with the things you didn't do than with the things you did.' - Mark Twain
Don't forget to leave a review of the campsites you have visited this year or last!
Wow, what a lovely post! This is what camping is about. Being surrounded by light at night living in a city but brought up in the country I totally get this. I am not in your neighbourhood, but can recommend sites up near Kirkbymoorside if you have a bit longer to get away. The CS at Fadmoor is good with wonderful views over the moors in the distance. Good visability. Tractors up and down all the time but that only affects your ears....LOL! Good luck!
Someone I work with is very keen on stargazing and he recommends Lucksall, near Hereford. I think he said they have their own rallys, they had one in March, but I don't know if it's just an anual event.
If you don't already have it - this might be a helpful thing to have to hand when planning your trips.
http://www.octopusbooks.co.uk/books/general/9780540086122/philips-dark-skies-map-britain-and-ireland/
Don't forget to leave a review of the campsites you have visited this year or last!