By Laura McGuire The former chief of over 50 insurance provider Saga has been appointed as the boss of AG Barr, the drinks giant behind the production of Irn Bru. Boardroom heavyweight Euan Sutherland was named this morning by the Scottish firm, replacing longstanding chief Roger White who announced his departure over the summer. Sutherland has held a number of senior roles at some of Britain’s best-known brands, including Superdry and Kingfisher. He stepped down as head of Saga last November after four challenging years that included the closure of its cruise business during the pandemic. Sut…