As was said above, UK Online are part of the Sky group and offer virtually identical internet (if anything, arguably better). They are also LLU, with the same fibre backhaul, no real ToS or FUP (I pull ~ 500GB and occasionally 1TB of data a month and they don't care). £25 a month is nothing when you consider I'm getting 2.2 MB/sec (>2,200 KB/sec) 24/7/365, experience no 'traffic management' or shaping, no throttling, and pull up to 1TB a month without complaint. UK Online ROCK! Seriously.
But Sky have way inferior customer service compared to UK Online (who have dedicated "answer in 2 rings" UK-only tech support, 24/7). Also their tech support are, shock horror, techies! Not script monkeys. With Sky people have to "hope" to get through to the real techs, and sometimes wait days for call-back. UKO will put you straight through to the actual net-admins just for the asking!
You know you want to! UK Online are by far your best ADSL2+ option. If your line is good enough, they'll also uncap your line to 24Mbps so ignore the 16 meg thing on their website. I'm currently getting 22.5 Mbps

Forget the mandatory DG834GT purchase. It's money so well worth spent you'll forget the inconvenience as soon as it's listed on an auction website...