Video: Royal Mail 'had to put stamp prices up' The price of a first-class stamp will rise from 46 pence to 60 pence next month. Second-class stamps will rise from 36 pence to 50 pence. The rises follow the decision by Ofcom, the postal regulator, to remove the cap on what Royal Mail can charge for first-class stamps. The price of second-class stamps will still be regulated. Ofcom said that Royal Mail has been given the power to set its own first-class stamp prices to make it more commercial and"safeguard" the universal postal service.