From the bbc website-
The price of a first-class stamp for a standard letter will go up from 46p to 60p on 30 April
A second-class stamp for a standard letter will go up from 36p to 50p on the same date
A first-class stamp for a large letter weighing up to 100g will rise from 75p to 90p
A large letter sent second-class will cost 69p, rather than 58p
Parcels, franked mail, and recorded post will also be going up in price
Looks like we are going to have to start charging more for postage for sending our nappies-boo!