http://www.royalmail.com/sites/defau...March-2015.pdf
in short:
The price of a 1st Class stamp will increase by 1p to 63p
The price of a 2nd Class stamp will increase by 1p to 54p
The price of a 1st Class Large Letter stamp will rise to 95p and a 2nd Class Large Letter to 74p.
http://www.bbc.co.uk/news/business-31660724