Tesco shifts its milk supply from Arla to Muller

Could changes to Tesco's milk supply chain mean yet more misery for dairy farmers? One analyst tells us that the effect on the industry will be seismic.
Scientists in research centres across the UK have launched a study to find out whether sea creatures like mussels have an impact on the effectiveness of offshore renewable energy projects.
Caz Graham revisits a Cumbrian dairy farmer whose entire herd of cows had to be culled back in 2012 after they fell sick with a complex combination of different strains of a pathogen called mycoplasma.

Presented by Caz Graham and produced by Beatrice Fenton.