Virgin Media claims online speed testing services will not be up to the job when testing its forthcoming 50mbps broadband service.
Broadband users often use online speed testing sites to make sure they get what they pay for, but Virgin says busy and congested online testing sites cannot give accurate readings for its faster service.
Virgin Media now intends to provide its own monthly tests to show actual speeds received by customers, but many users will no doubt be sceptical if the tests are not independent.
Virgin claims that measurements on online testing sites can be out by as much as 40%, and that when its current top speed of 20mbps increases to 50mbps, the problem will be exacerbated.
BroadbandChoices, which is a provider of speed tests, is working with Virgin on the problem.
Michael Phillips, BroadbandChoices.co.uk product director, said, "The new 50Mb product Virgin Media is launching is ahead of current testing technology. Consumers come to us for reliable information and we share Virgin Media's desire to improve the accuracy of speed testing."
One way round the problem is to provide consumers with a hardware product that connects to their modem to give more accurate readings, a system supported by regulator Ofcom.