I've read on here of certain problems with the TTTV. If you have SKY then the TTTV doesn't add anything, and price will go up unless you re-negotiate before the end of contract.
Why not phone SKY and try to haggle an inclusive contract if you are continuing to use them? Do they still give free broadband? Don't think you can get the anytime calls with them, though I may be wrong.
I am out of contract and won't take a new one with TT as the only time time I did I had 12 months hassle. Admittedly since then I've had very little problem, but if I do then I'll be away.
You could post the offer so others can see what might be available. I suspect you got a low price to tie you in.