It airs on a Friday night on Watch. The times vary weekly so you have to check what times it's on. This week that's 9PM. And then it's repeated Saturday mornings.
Sad news? This channel is only on Sky. However, considering that the episode is up on Youtube hours after it's aired in the US this doesn't really matter.
Thought I'd post in case someone wanted to watch it on TV
http://www.itv.com/TVGuide/Search/default.html?intcmp=NAV_TVGUIDE3&tvgPageNumber=1&tvgSearchPhrase=dancing%20with%20the%20stars
*hugs*
xoxoxo