I don't know what they are using but it is really annoying. They insert virgin media ads into pages and sometimes when you select a website link on a website ctrl+c copy and paste in to another tab it pastes as www.virginmedia.com.!?!?!.
If they are not inserting stuff, I don't know how to explain that.
It took me ages trying to disable their custom website not found error service. I click to disable. It said disabled, but it kept coming up even it showed it was disabled.
Private vpn makes more and more sense....