Batman: The Brave and the Bold
1x04 Invasion of the Secret Santas!
1x06 Enter the Outsiders!
I sort of have and sort of haven't caught up with Channel 5's airings now -- they've also had six episodes, but skipped the Christmas one (understandably). So... I mean, it doesn't matter, does it.
Yes, Prime Minister
2x04 A Conflict of Interest