Jimmy Doherty takes to the skies above Israel as he joins the battle to protect the bell pepper crop from the Mediterranean fruit fly, while Kate Quilton investigates premium-priced manuka honey, which is marketed for its anti-bacterial properties. Matt Tebbutt visits the UK's largest leek producer, where he's shocked by how much of the vegetable goes to waste, but amazed by a mobile factory on wheels that can process 60,000 leeks a day.