LONDON (Reuters) – The maker of Irn-Bru, the iconic orange Scottish soft drink, said on Tuesday that it had increased its prices due to soaring inflation in Britain. Consumer prices are rising at the fastest rate in almost 30 years, stoked by global supply chain problems and increases in the price of raw materials, forcing companies to increasingly pass higher costs on to customers. Irn-Bru is regarded by many as a national symbol of Scotland and is known for its surreal and sometimes provocative advertising campaigns. Described as Scotland’s other national drink, with whisky being the first, …