Telewest is testing a 2Mb (Megabit) blueyonder broadband Internet service, offering home users commercial grade bandwidth.
The pilot service will offer continuous cable connection to the Internet that is 40 times faster than traditional dial-up services and four times faster than BT's domestic ADSL services.
Telewest Broadband managing director Gavin Patterson said: "We've already proven there's a need for speed, with ten per cent of our Internet customers taking our 1Mb service. Now it's time to shift up another gear, offering customers the option of going even faster with the natural bandwidth benefits of a cable connection.
"Not every user will want a 2Mb connection, but we're well on the way to offering a menu of broadband services to suit different requirements, while BT perseveres with its one trick pony."
Telewest customers already using the 1Mb service will be offered the chance to trial the 2Mb service at no extra charge. The trial launches this week.
Feedback from 1,500 triallists will be used to develop the service in advance of a full national launch later this year.