1x04 Episode 4
[Watch it (again) in HD on iPlayer.]
2x05 Episode 5
The National Lottery: Who Dares Wins
6x01 (23/3/13 edition)
A National Lottery game show that's lasted six series! I believe, statistically, they've done well if they get a second, so that's testament to how simply addictive and play-along-at-home-able this format is.
[Watch it (again) on iPlayer.]