Royal Mail is investigating problems with new barcoded stamps, after a GB News investigation found Britons are being charged £5 for their post, despite the senders insisting they bought the stamps from a reputable source. GB News has highlighted numerous instances from all over the country, where Britons have bought first and second-class stamps from Post Office, shops in Post Offices and small supermarkets. However, Post Office has said Post Office Ltd receives its stamps direct from Royal Mail’s secure printers. Following a meeting on Tuesday between Post Office Minister Kevin Hollinrake and…