1x22 Risk Management
That would've been a much bigger surprise if they hadn't announced the casting...
1x06 Saturnalia [season finale]
[Watch Bananae and Saturnalia (again) on ITV Player.]
1x03 Episode 3
[Watch it (again) on ITV Player].
Would I Lie To You?
7x02 Episode 2
[Watch it (again) in HD on iPlayer.]