Just a bit of information I picked up today...
Any account with Virgin Media/NTL in default/missed payment stages has been removed from your credit files. Due to a data anomaly from the migration between IT systems all files will be cleared prior to July 2008.
"Virgin Media Accounts
Virgin Media have removed all Credit Agreement information prior to 20/04/2008 from all its customer files due to anomalies in information resulting from system migrations.
Virgin Media will continue to provide Credit Agreement information as of July 2008 - please accept our apologies for any inconvenience caused."
So if you missed payments to them or you have been subject to a **** up by their systems you can sleep a little easier at night.