By Charlotte Smith & Rom Preston-Ellis Tea connoisseurs have warned against a common practice many of us are guilty of that can lead to a bitter brew. The beloved hot drink is a staple in many people’s daily routine, with 8.2 million Brits enjoying tea two to three times a day. Some of us may like our tea piping hot and robust, while others might prefer a creamier cuppa with an extra spoonful of sugar. Despite individual preferences, experts insist there are certain things you should never do when making a cuppa. In anticipation of National Tea Day on April 21, specialists from Wren Kitchens, …