Prime country house prices rose an average of 2.0% in the first quarter of 2010 according to Knigth Frank.  Prices have now increased on an annual basis in every Knight Frank except Scotland.

For further info:

http://www.knightfrank.co.uk/news/Country-house-prices-continue-to-increase-according-to-the-latest-figures-from-Knight-Frank-0178.aspx