An Irn Bru fanatic is calling on Scots to boycott the country's national soft drink in defiance of the Sugar Tax and make their own - following his step-by-step guide. Lee Callaghan, 49, has come up with a 'home-bru' version of the popular fizzy pop - which he creates in his kitchen. He remembers being just three-years-old when his gran would feed him ginger fizz in a baby bottle. Lee grew up rarely drinking any other soft drinks and was outraged when Barrs changed the recipe - calling it "a breach of civil liberties".