call up the ntl helpdesk and ask them to run a BLUETOOLS diagnostics test all the way to your cable modem and look for the cable type and finally match that with the list of known NTL faults . If the cable on which u r on is at fault you can not do anything . Otherwise request the guy to escalate the matter to the server support queue .
7 60 ms 28 ms 127 ms nth-bb-b-so-200-0.inet.ntl.com [213.105.172.194]
looks like a routing issue to me ..... 