<p>Former Brussels correspondent Adam Fleming explores how businesses have adapted to new trade rules, three years after the UK left the EU. </p><p>He finds out why allergy-friendly nutrition bars are being sold to Australia and the Middle East instead of the EU, and the reason exports of British eels have ground to a halt.</p><p>Presenter: Adam Fleming Producers: Diane Richardson and Sally Abrahams Editor: China Collins Production Co-ordinator: Janet Staples Sound: Neil Churchill</p>