I've installed the database off http://www.pocketgpsworld.com/uksafetycameras.php myself - and thus my TomTom Go 500 payed for itself within 1 month of using it...
Belting down the M4, outside lane, when I come accross one of those Novas - you know the ones - wheels so wide you could balance a house on them and an exhaust you could lose an arm in. He's doing 78 (flat out I think) and refuses to move over.
So there I am - getting quite frustrated, when the GPS suddenly speaks out "Gatso". I ease down and watch him fly through and get the old double flash
Made me happy