Sean Fletcher explores the food market in Hay-on-Wye, getting tips on growing your own and finding out the secret to making fudge. Onkar Singh Purewal is in Cardiff to discover how setting up a food stall has provided a lifeline for some in the community, and, in Ceredigion, he discovers the key to making sourdough bread. And farmer Meinir Howells gets to grips with turning rapeseed into oil in Rhuthin.