For years, its slogan was Barr's Irn-Bru: made in Scotland from girders. But now the beloved Scottish fizzy drink's catchphrase is wrong in two ways: first, the closest it gets to girders is 0.002 per cent of ammonium ferric citrate listed in its ingredients.And second, the last member of the Barr family, who have made Irn-Bru for more than 130 years, is to step down.Robin Barr, whose great-grandfather set up the family business in 1875, said he was retiring as chairman of AG Barr in May, after 31 years of running the company.nd second, the last member of the Barr family, who have made Irn-Bru for more than 130 years, is to step down. Robin Barr, whose great-grandfather set up the family business in 1875, said he was retiring as chairman of AG Barr in May, after 31 years of running the company.