Go to http://www.tomtom.com/10
and register for a free £10 voucher.
In the shopping basket, once you've added the v4, enter the code they email you and you will get a £10 discount!
Features of TomTom ONE V4 Classic
High quality 3.5 inch colour TFT LCD anti-glare touch screen, 4:3 format, QVGA, 320 x 240 pixels, 64k colours
92 x 78 x 25 mm / 148 grams
Pre-installed maps of UK and Ireland on internal memory
Connectivity: mini-USB, RDS-TMC (via mini-USB - TMC cable not supplied)
Internal Lithium-ion battery (up to 3 hours operation)
Compatibility: Windows and Mac OS X 10.3 and above
Car speed linked volume
Enhanced TomTom speaker system
Automatic day/night mode
Compatibility with TomTom HOME