Royal Mail has charged innocent Britons £5 to get their post after senders unknowingly used fake stamps which were bought from Post Office and some well-known stores. An investigation by GB News has found books of stamps bought directly from Post Office and some local supermarkets have been deemed “counterfeit”. Affected recipients are now having to fork out £5 to get their letters – four times the cost of a standard first class stamp – after Royal Mail doubled the surcharge from £2.50 on October 30. GB News has seen examples of first and second class stamps bought from Post Office sites being…