on the subject of shat-navs .... i've got a cheap n cheerful 'navigo' satnav unit loaded with tomtom software that was 'sourced' from the internet by someone other than myself.
it's just fine on b-roads and rural treks, but it turns out that when riding in city centers you need to update the maps fairly frequently, as i learned on a recent trip to brighton when it sent me straight down a maze of bus lanes. i've done a bit of a search and can't seem to find anywhere to get a new uk map for free without buying a registered unit.... any ideas?