Virgin media broadband worked just fine on the same coaxial cable as the television,certainly better than the old multi pair telephone cables, the main runs have been unrated to fiber optics round here but it still comes into the the houses on coaxial drop ins,the same cable that carries the TV progs.
Been with what was Blueyonder and is now Virgin for near ten years now I've never had any serious complain,longest I been off line was a couple of days due to a cut cable.
If you can get cable TV broadband go for it.
PS,I can watch progs on the bbc iplayer high definition channel with not a single hint of jerkiness or pauses,of course a lot depends on your graphic card for HD as well.