Now I have a little more time....
Just remember cashback is never guaranteed, its pretty likely to track but never make a purchase based on definitely getting the cashback. Also the two main sites (quidco and topcashback) are often very similar in deals but then sometimes one will offer a great one like this was so its always worth keeping an eye on them both.
As for current deals, this one is no more but quidco are offering a pretty nice cashback at the moment still for BT and there is still a £100 Sainsburys voucher up for grabs. It depends on what you need though, I took a much lower cashback as I didn't want the TV part of the package. Its worth checking both to see what works out best for you.
http://www.quidco.com/bt-broadband/
http://www.topcashback.co.uk/bt_total_broadband/
EDIT: Just checked and I have £180 tracked to pay out in January and a further £90 that I'm waiting to hear on.