As part of the Brexit fallout, British and French gunboats have eyed each other off in the English Channel over shellfish. At the centre of the feud is the self-governing Jersey Island. It's closely allied with Britain but lies just 22 km off the coast of France. A flotilla of French fishermen are threatening a blockade over tougher licencing rules, while Jersey’s fishermen are now banned from French ports. Sarah Morice is in Jersey.