2/6 Adam (Lenny Henry) discovers a bundle of long-lost love letters addressed to his late mum.
5/6 Brian Cox, Robin Ince and guests ask, 'What's the point of plants?'.
1/6 Marcus Brigstocke invites comedian Barry Cryer to try new experiences.
1/4 Ruth gets to perform her favourite sketch - she just has to get Lucy to understand it.
2/4 Time runs away in preparations for the switch-on of the BBC Collider.
3/4 Harvey and Sean's jobs in the firing line, while Robbie discovers a new love of birds.
1/8 Stephen Fry, David Tennant, Julian Clary and Paul Merton take the Just a Minute challenge.
3/4 Matt gets to mentor the boss's granddaughter and design a building with a big turret.
1/6 Will the Sparrowhawk Family Centre survive the Big Society?
1/4 The American humorist reads from his extensive collection, including some guilty secrets.
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