not necessarily what you want... but Dr. Who is on Netflix streaming.
Only other way that I've read about somewhere at some point in time is using bbc iplayer (not even sure they use that any more since I haven't looked at that site in eons)... I don't know if it still works or not, but some people that had to get there UK TV fix used proxies to watch the Iplayer all over the world, in much the same way that some of the threads around here in the forums are talking about how people are watching ustvnow in the US by proxying their way out of the US when they sign up, etc.
http://forums.roku.com/viewtopic.php?f=28&t=46566&p=359897#p359897 -channel lists/tools
http://forums.roku.com/viewtopic.php?f=28&t=64096 -linear channels