We used data openly available from the Care Quality Commission (CQC) (http://www.cqc.org.uk/content/how-get-and-re-use-cqc-information-and-data) and research from TrustedCare.co.uk (who commissioned the project).
The data shows 4,500 (approx.) of the 26,000 (approx.) care services have never been inspected and in the worst counties over 20% of care services inspected failed to achieve a rating of 'good'. Perhaps most interesting is that the data shows no correlation between the amount users pay and the quality of care they receive; many of the counties with the highest costs are ranked in the bottom third of the league table.
The Telegraph (http://www.telegraph.co.uk/news/health/elder/11988560/Costly-care-homes-may-not-be-the-best-league-tables-reveal.html) has used the data in an article today which also includes quotes from a number of prominent bodies/figures in the care industry.