House prices in parts of the UK have risen by more than five per cent over the last 12 months, according to Barclays Mortgages Postcode Ownership Index An analysis of house prices in 15 cities across the UK has found that some areas have seen prices rise at double the national average of 2.6 per cent, with many of these in the North of England and Midlands. The Barclays Mortgages Postcode Ownership Index is based on data provided by Barclays Mortgages to Hometrack, a property analyst, using average house prices from Zoopla.