A major fruit farmer tells us he fears supermarkets will turn to cheaper imports because British costs of production are just too high. We ask the retailers' representative how supermarkets can keep backing British without increasing shoppers' bills. All this week we're looking at farming and renewable energy. We visit a farmer growing miscanthus grass as biomass, and hear how a heavy-liquid gravitational battery could help store renewable energy on farms. Presented by Anna Hill and produced by Beatrice Fenton.