Look for a 2nd hand TomTom start 25 or any nav3 device or to go older choose a nav 2 device such as the tomtom 940 or950, plenty of them on offer in Gumtree and EBay.
Yes thanks I think you could be right. I tried before but I think the servers were down or something, maybe it was confused because I've two sat navs and the other one is well out of date.