Virgin Media are now the main cable providers, you get phone Internet and TV in one package. They are three previous competitors all rolled into one, so it should be quite good, though I don't know for sure.
SKY are satellite TV, they also now offer free broadband with their packages, but I don't think they do a phone service.
BT do phone and Internet, but don't provide TV. But since quite a lot of good TV is now on Freeview, this isn't such a problem. Plus BT claim to have the most reliable Internet available. I can't vouch for their customer service though, which is generally considered to be infuriating.
Hope that's some use to you.
