It say here:
Virgin Media to double the speed of customer broadband
Virgin Media will double the speed of its broadband service for more than four million of its customers, the company has said.
found here:
http://www.bbc.co.uk/news/technology-16491614
Double speed should be like this:
Planned VirginMedia Download Speed Upgrades
* 10Mb increased to 20Mb [2Mbps Uploads]
* 20Mb increased to 40Mb [4Mbps Uploads]
* 30Mb increased to 60Mb [6Mbps Uploads]
* 50Mb increased to 100Mb [10Mbps Uploads]
* 100Mb increased to 200Mb [20Mbps Uploads]