Despite coffee shops lining every high street, Britain remains a nation of devoted tea drinkers. Our instinctive reaction to any drama, whether major or minor, is to switch on the kettle and prepare a cuppa. Black tea even offers multiple health advantages, as Monty Don has highlighted previously. But which variety reigns supreme? We typically select one brand, almost randomly, and remain loyal to it indefinitely without truly exploring other options. Yorkshire Tea, PG Tips, and Tetley are