I might consider it once my contract with Virgin is up. Their broadband supply is good but their customer service is absolutely terrible to the point that I actually still get a little annoyed when I think about how bad they are.
If I knew anyone else round here who had BT so I could compare speeds and reliability I would seriously consider it. Even though it would be more expensive than just virgin broadband on its own.
Just really wary of changing and ending up with bad speeds or unreliable connection. I always get a healthy 30-40Mbs with Virgin and its never dropped out in the ten months since I moved here.