I've got one of the Morpheous Geodesy units I've had for about a year - very good, but just speed camera warnings. It's pocketable and just clips into the mount, so can be easily moved between cars. Comes with a modem cradle, you just drop it in & it phones home to update the database & firmware. It *does* warn you of cameras facing the other way on the same road, though, which is something the competition's units have sussed.
Avoid their Roadpilot though - I got one and sent it back. Dim & whining backlight, too-quiet warnings and a screen unreadable due to reflection.
There are others to consider - Road Angel, Snooper's S6-R, Origin Blue-i and the Cyclops all of which are GPS + database of speed cameras.
This place seems to sell all of them, pretty much:
http://www.radardetectors.co.uk/
Hugo