i joined this forum back in sept and thanks to many of the members on here such as tendriver, i managed to fully update the tomtom to newer maps and settings:-
http://www.navitotal.com/forums/showthread.php?2747-Update-Go-520/page1
However, since i have been using it, i have found that after entering a postcode, the tomtom is finding a lot of incorrect addresses which at first was irritating, but now is a big issue as today i was only supposed to go about 4-5 miles to a local small nhs treatment centre, but ended up at the end of small a farm and also doing double mileage and got stuck in the snow with kids

thanks guys