tomtom's do everywhere mate
but to be honest, go into a halfords or the like and have a go at the different ones, lots of peole use tomtom because they are the most user friendly, even though other versions like the garmin or navman might have more fetures or better this or that, they are a bit too complicated to be able to use easily wihtout having to decipher loads of different menu's and options
we are currently changing over to palm pilots and i'm not sure what system they have on them, but they have been directing us down country lanes, cycle paths, bridle ways and all sorts