https://www.education.gov.uk/publicatio ... -GCSEs.pdf
There are 2 models for early GCSE entry and while schools seem to like parents to think they are being really innovative and have the best interests of pupils at heart, this is almost never the case. Both models, the one used by fairly high-achieving schools to 'bring on' their 'outstanding' pupils in the name of pandering to the 'gifted and talented' among their cohort; and, more widely, that used by schools with a poor demographic and a desire to improve intake, are cynical ploys to manipulate positions in league tables and thus appeal to a more desirable (middle class) market. I assume the move away from modular GCSEs will be a powerful disincentive for the latter group to persist with this practice, as there won't be chances for multiple modular resits.
Agree with Mindset btw, consultancies abound and these supposedly 'innovative' heads are basically buying off-the-shelf improvement packages at vast cost. Look for the buzzword 'excellence' and behind it will be a consultancy!