Episode 15

The team look at how the more exotic crops - the melons, pumpkins, honeyberries and blueberries - are coming on, safe in their polytunnels.

Jim and George give a masterclass in the art of fruit and rose budding, while Carole shows how to propagate Streptocarpus and Begonia rex.

Carole also visits Gogarbank Farm in Edinburgh with some newly-recruited inspectors as they learn how to recognise the most common potato varieties and genetic variants, as well as confirm virus and bacterial diseases.