I don't know if they are broadcasting any of DC tv-specials in Britain. What I do know is that in the Netherlands they are broadcasting his tv-specials.
Maybe you can receive that channel in Britain, because here in the Netherlands we can receive the British channels: BBC 1 and BBC 2.
The broadcast is every Wednesday evening at 20.20 that is in your time 19.20. It is broadcasted at channel nederland 2. The only think there is about it: the shows are Dutch sub-titled. In total there are six shows. The first was last week and tonight is the second one.

I hope for you that you can receive this channel.

Greatings

Evelien