Well the official line is this (taken from Pates website)
Pate's is normally at the top of these measures, however this year we are unlikely to feature. The reason for this is that we took the decision to follow an iGCSE qualification in English, and at present the DfE does not recognise this syllabus in its tables (we expect this to change in 2015).
Odd, as I could have sworn they did AQA English last year...
It will be the same with STRS who do iGCSEs in many subjects too, so they wouldn't be counted. STRS also (rather healthily imho) doesn't insist on Ebacc, and so would score low on that particular 'measure of excellence'. A bucketful of salt is needed when looking at league tables anyway - this is just one factor that muddies the waters this time round. Higher achieving schools have turned more and more to iGCSE, so the ones 'at the top' are likely actually to be slightly 'lower'. Do we care?