I have just got Sat Nav. It's the NAVMAN iCN520 which is available from Argos (they have taken a £100 off it). I've found it to be pretty awesome with some pretty cool features:
Time till Destination, Travelling Speed....etc etc...the usual.
Last night just installed a free SPEEDCAM database available from:
http://www.pocketgpsworld.co.uk Installs Gatsos, Specs, Mobile, Temp (knows the ones that work out your speed between two points and traffic lights.
No need really for the expensive Road Angel.
G