Cheapest Sat Nav I could find that had both free lifetime maps and traffic. No phone connection needed for traffic - it uses the power cable as an aerial so if you want live traffic connect it via cigar lighter point rather than car's USB point. Good size screen, long data cable that should reach pretty much anywhere on the dashboard or windscreen - buy yourself some adhesive cable clips to go with it. Very good reviews and best price. Seems to be the 2508LMT-D from the description. 3% Quidco at the moment.
Maps covering UK and Republic of Ireland
Free Lifetime Maps
5 inch widescreen display
Free Lifetime Digital Traffic continuously refreshes traffic information to help you avoid queues, ready to use with no subscriptions
Garmin Real Navigation with Real Directions with references to recognisable landmarks Real Voice for a more natural voice and Real Signs reflect the real life counterparts to avoid confusion
Active Lane guidance uses a combination of voice prompts and visual cues helps you through tricky exits and junctions with an animated graphic displayed next to the map view
PhotoReal Junction View shows which lane you need to be in at major junctions and exits
Birdseye Junction View for detailed view of junctions from overhead
Up Ahead feature displays helpful points of interest along your route such as the nearest petrol station
Garmin express helps you keep your Nuvi up to date with everything in one place
Safety camera warnings with speed limit alert
Comes with Lifetime Digital Traffic antenna, in-car power cable, suction mount, USB cable and quick start manual.
What does it lack that more expensive models may have? - no Bluetooth or carry case.