[holding answer 6 October]: The information broken down at A*-C can be found in table 3 of the following Statistical First Release (SFR):
DCSF: GCSE and Equivalent Examination Results in England 2006/07 (Revised)
http://www.dcsf.gov.uk/rsgateway/DB/SFR/s000768/index.shtml
Further breakdown of grades can be provided only at disproportionate cost.