Nick there may be a few good docos that might suit you here. Most can be viewed in HD!
http://www.youtube.com/user/ZZZFROMHELLZZZ
Here is a sample
http://www.youtube.com/user/ZZZFROMH...71/HsifO7fWgZY
On dark matter
http://www.youtube.com/user/ZZZFROMH...54/F5TWn1ALuZw
This bloke has had problems with copyright so some docos may disappear.
Search utube with 'BBC and doco' as searches.
Hope this helps a bit.
Bert