http://www.radar24.co.uk/
Avoid Speeding Fines, Speed Traps & Mobile Cameras.
Subscribe to this service and for 50p they will send you text messages directly to your mobile phone with information on the latest speed traps and mobile cameras in your area.
With what people tell me the Radar Traps are a pain in the rear, so sounds good for just 50p to avoid a ticket.
Here I use a radar detector but I don't know if they are legal in the UK.