The Office for National Statistics has published 'Intercensal Mortality Rates by NS-SEC, 2001-2010'. Some key facts are that, for men, there was a mostly steady decrease in mortality rates between 2001 and 2010 for each class. Over the period 2001-2010, the actual difference in mortality rates between the least and most advantaged classes declined, but the ratio increased for both sexes.
National Statistics Online: http://www.ons.gov.uk/ons/rel/health-ineq/health-inequalities/intercensal-mortality-rates-by-ns-sec-2001-2010/stb-mortality-ns-sec-2001-2010.html
BBC News report: http://www.bbc.co.uk/news/health-17811732