[Chrysalis]

it means that depending on where you live the route to other isp's can be entirely different. So you may have a good ubr like a friend in a different city but if ntl route you over lower quality transit then tough luck, most of the time this may not have a noticeable affect but in some cases it may cause problems and people will be scratching heads over it because their mate on ntl is fine so it must be their computer.