It's OK.
It seems rather inconsistant and hard to navigate. The URL consistency is particularly awful.
For instance, the URL to the main site is
http://sky1.sky.com/, but their Gladiators site (for instance) is located at
http://gladiators.sky.com. It would be easier to remember if the URL to it was
http://sky1.sky.com/gladiators.
Even worse is the Ross Kemp site, which is located at
http://skyoneonline.co.uk/rosskempgangs/ - it's not even on the Sky.com domain.
I know that some of their sites, such as The Simpsons (
http://sky1.sky.com/the-simpsons) are subsites of the Sky1 URL - but surely it would be easier for users to remember the locations of the sites if they were all like that? I mean, even if they set up redirects...
...but that's me nitpicking.