Look there's a perfectly simple way to answer the 'debate' about whether or not A Levels have become easier.
Take 1000 of this year's A level students and ask them to sit the exam papers that were set 20 years ago. Mix their answers in with those submitted at the time (I'm sure they've been archived somewhere) and look at the results.
My suspicion is that a statistician will not be required to validate the significance of the results - I doubt that the current bunch will break the half way mark.
I don't blame the students by the way - they have been let down and betrayed by the political meddling in education.