and its not illegal either if your the paranoid type!
Im afraid it is illegal, nearly all of the programs on that site are still under strict DMCA legislation and will be for a long time.
The best place which is generally allowed is currently
UK Nova - although new accounts only become poissble a small number of times each day. But, if like me, you manage to get one, it is an absolute life saver when you miss programs (and in my case lately, the Sky+ box has sound problems) and would be amazing if you were out of the country. I managed to get Webby an account on there and he forgot to use it when he was in Lapland
It is generally accepted by almost all television companies, in fact the BBC even mentioned it as a good thing at a news conference regarding their new "BBC Archive".
The reason it stays "accepted" by TV companies is due to the fact they have very strict rules on content you can upload - they dont allow anything that is available on DVD (their motto is, if its available on DVD, buy it) or that is not UK programming, also they restrict programs that are under intense protection such as Doctor Who etc...
But for most UK programming, its there and the torrents are fast (usually at least 200KB/s+) due to the fact their tracker uses a ratio system.
Deffo worth trying to get an account there. Ive been using it for about 4 months now, use it quite reguarly.
Another good TV torrent site is Scene Torrents, but its nigh on impossible to get an account there, ive been trying for weeks now haha!