How much does a first class stamp cost?
4 April 2011 Last updated at 00:16 BST
Members of the public talk to the BBC about how much they think one first class stamp costs.
From Monday 4 April, the price of a first class stamp for standard items is rising 5p to 46p. The cost of a second class stamp is rising 4p to 36p.
It is the largest increase since first-class postage began in 1968. But Royal Mail says "UK stamp prices for standard letters weighing up to 100g will continue to be amongst the lowest in Europe".