The Hairy Bikers in Cardiff

In this rather up-market episode, the Bikers head to Wales for some posh nosh. They discover Welsh cuisine is far more sophisticated than leeks and laver bread as they meet three Mums, each with their own take on what makes food fancy. For Avis Davies, it's a Maltese stuffed marrow dish; Derith Rhisiart takes the humble Welsh cake as the basis for her very posh cheesecake, and for Jewish mum Ruth Joseph no posh table is complete without her special orchid gateaux, made in the tin her mother brought to Britain when fleeing Nazi Germany as a child.

Mum's Know Best, they say. See Icons passim for the scientific proof.