Regarding Speed Camera Databases, without an audio warning a simple icon on the screen is far to easy to miss = fine and points.
Auto Express have just done a group test and the C50 came out best, and is currently available with lifetime updates for about £120 - search the web.
Have just bought one to replace an ancient Snooper and so far it has ID'd every camera I knew about. It is small and easy to mount on the dash, voice alerts take a little while to get used to but much better than a £90 fine and 3 points.
I have tried Smart Phone Apps and have the PocketGPS database on my TomTom - I am a belt, braces and string type of person when it comes to speed cameras.
I like the TomTom as with PocketGPS it gives the best warnings and shows locations on the route but the new C50 is tiny and such a simple fit and forget device that it is always in the car giving warnings, highly recommended.
AutoExpress link
http://www.autoexpress.co.uk/accessories-tyres/87053/speed-camera-detector-reviews-and-group-testAlso link to my way of wireing in devices which use a ciggy plug for power - to keep the install neat and tidy
http://www.autoexpress.co.uk/accessories-tyres/87053/speed-camera-detector-reviews-and-group-test