You've really come to the wrong country.
Pocket GPS Speed Trap Camera database on a Tom Tom, Iphone or Garmin and your sorted.
You can still use your Valentine 1, just make sure X band is turned off (not used by police here).
Some people do also use laser jammers in the UK, but the police and the courts are wise to these devices, often sold as 'garage door openers'. I used to have one and it saved me a few times on the M40, but you are now in danger of having your car lifted and done for perverting the course of justice.
Best
M5 Powered
P.s. loads of stuff on the different revenue raisers here
http://www.ukspeedtraps.co.uk