Cheers Stifler 
Overall it seems to work out that Virgin would be about £5 more expensive pm.
But the broadband would be a hell of a lot quicker, plus Tivo does sound a lot better.
Hard call like 
It all depends on what you want, Virgin Media has pretty much ever popular channel Sky has, it just cuts out the crap like the god channel and the welsh speaking only channel. You do miss out on Sky Atlantic but honestly I've never watched anything on there at all. The bonus is that you get a hell of a lot more on demand features, fair enough you could get a bit of it from online but it's easier through Virgin Media and they offer other on demand stuff as well. Sky on demand is also on Virgin Media as well. The Tivo box makes using on demand so much easier with the suggestions.
It all depends on what you want though, do you want to watch more on demand stuff with possibly faster internet or are you happy with Sky and do you value Sky atlantic and Dear god channel.
One of the biggest deal breakers for us was that we can get signal anytime, we got a poor signal from Sky and now with winter coming and the snow, rain, wind etc this is the time you want to be tucked up in bed watching TV instead of having to go out because you have no signal or sitting doing nothing.
Also remember that with Virgin Media you rent the boxes so if anything goes wrong with it it's replaced free of charge, with Sky after a year it's your problem and if you don't pay for their box insurance then the boxes can cost something like £300.