- Series 1
- s01e01 - 2005-09-15 - Architect
- s01e02 - 2005-09-22 - Musical Genius
- s01e03 - 2005-09-29 - Biogeneticist
- s01e04 - 2005-10-05 - Chess Grandmaster
- s01e05 - 2005-10-13 - Chef
- s01e06 - 2005-10-20 - Racing Driver
- Series 2
- s02e01 - 2007-05-01 - Barrister
- s02e02 - 2007-05-08 - Explorer
- s02e03 - 2007-05-22 - Jockey
- s02e04 - 2007-05-29 - Mayor of London
- Series 3
- s03e01 - 2008-11-17 - Photographer
- s03e02 - 2008-11-24 - Antiques Expert
- s03e03 - 2008-12-01 - Magician
- s03e04 - 2008-12-08 - Health Guru
- Series 4
- s04e01 - 2010-03-04 - Test Pilot
- s04e02 - 2010-03-11 - Mathematician
- s04e03 - 2010-03-18 - Entrepreneur
- s04e04 - 2010-03-25 - Cyclist
- s04e05 - 2010-04-01 - Miner
- s04e06 - 2010-04-08 - Weatherman
- Series 5
- s05e01 - 2011-07-21 - Astronomer
- s05e02 - 2011-07-28 - International Diplomat
- s05e03 - 2011-08-04 - Gardening Expert
- s05e04 - 2011-08-11 - Royal Speech Therapist
- s05e05 - 2011-08-18 - Lorry Driver
- s05e06 - 2011-08-25 - Undercover Journalist