From the same site you can pick up a new TomTom for £75 but imho this is much better value, especially when you remove turbodog!!
MyGuide 3218 Satellite Navigation for UK & ROI
Not only is this product great value it has some fantastic features that you will find very useful when you're on the road. With a 10 out of 10 rating from some of our customers, they love that this satellite navigation will show a variety of points of interest such as, petrol stations, shopping centres, museums and football grounds.
All of the features you would expect from a more expensive satellite navigation packed into a slim 1.8cm design! With a 3.5" TFT colour touch screen you will never miss that turning! Also this unit boasts 'turn-by-turn voice navigation with road names so that you can stay on the right track.
With a stylish car mounting window kit you can place the satellite navigation wherever is best for you on the windscreen.
Also with a life long re-chargable Li-ion battery you don't have to worry about losing charge right at that crucial moment.
*There is free delivery to selected stores, if you can't pick-up in store then it may be worth buying from ebuyer where it's £42.49 with free delivery http://www.ebuyer.com/product/161002
There's s0me pretty good reviews on both sites especially when you mod this.