The available information on GCSE and equivalent results by local authority area is contained within Table 18 of Statistical First Release (SFR) GCSE and Equivalent Examination Results in England 2006-07 (Revised) which was published in January 2008. This SFR can be found at:
http://www.dcsf.gov.uk/rsgateway/DB/SFR/s000768/index.shtml.
Figures cover all maintained mainstream schools (including CTCs and Academies) and maintained special schools, but exclude hospital schools and pupil referral units.