Independent School Results and League Tables
The Independent Schools Council publishes detailed spreadsheets of GCSE and A Level results Note that a number of leading public schools have opted out of publishing their GCSE and A Level results because they, and the ISC, do not support the publication of School League Tables.
The results on the ISC site are presented in alphabetical order by school. They are useful for comparing two or three schools at a time, but do not give a wider picture of attainment.
For the bigger picture the Times publishes a searchable database of independent school results at A Level and GCSE. Once again, it does not include the small number of schools that have chosen not to publish their results.