The information requested is not available because the Department for Work and Pensions does not attribute sick pay to causes of illness.
The information is not available or held centrally, and could be provided only incompletely and at a disproportionate cost. Information on sickness absence for the years 2004, 2005 and 2006-07 has been published and can be obtained from the civil service website:
http://www.civilservice.gov.uk/about/statistics/sickness.asp