There are two independent sources of data on actual numbers of mortgage repossessions: The Council of Mortgage Lenders (CML) and the Financial Services Authority (FSA). However both are only available for the United Kingdom as a whole.
The Council of Mortgage Lenders latest press release on repossessions is on their website at:
http://www.cml.org.uk/cml/media/press/2456
The Financial Services Authority data are available on its website at:
http://www.fsa.gov.uk/pages/Doing/Regulated/Returns/IRR/statistics/