An update: they're now going with a scheme whereby students get to keep the better of the two grades given by two different methods, with teachers' predictions on the one hand, and the 'standardisation' system on the other.
Presumably this will lead to grade inflation.
https://www.bbc.co.uk/news/uk-53810655
See also Wales seeming being the first to switch to this approach: https://www.bbc.co.uk/news/uk-wales-53807854