@teenmum60 that’s what I thought too. I have just done a bit of research
Looking at last years stats they allocated a 7 or above to 16.8% of all eng language entrance whereas it was 19.9% for maths. So this is in line with the number of DCs getting a grade A or above in each of the subjects in the old style exams. So you can def see that they are pegging the number of available grades in the band to the distribution of grades pre change. Then they attempt to cream off 2 or 3% in this 7-9 grade band and give them a 9. Looking at the stats it seems that 3% actually got a 9 in Eng Lang whereas 4% got a 9 for maths. I THINK that this is because if you get a ‘lump’ of people all with the same grade they have to include them all.
Then they take whoever is left in the group (ie those that would have a 7 or 8) and give half of them a 7 and half of them an 8.
They then do their same exercise for grade 4-6, and then 1-3.
What I can’t see is how they determine the % to cream off for grade 9, but in all honesty that’s not really an issue for DD however I have been trying to find out for those of you expecting/hoping for 9s.
But....If they have published these figures I certainly can’t find them!!!
WRT the concept that some of the subjects have been taken only by the very academically able this works for them too. Let’s say that under the old system 100% of the applicants got a grade A or above. Under the new system 100% would be given a grade 7-9 and then the same formula applied. What would scupper it would be if 100% of them got an A* under the old system. Under the new system 49% would ‘only’ get an A 
I’m with Sos - it would be far simpler to pas/fail but unfortunately that doesn’t show who is truly gifted. In DDs school she’s probably in the top 15% for all subjects but most of the girls in previous years have got a full house of A-A* so trying work out what that really means is impossible. She could be in the top 15% in her school but the bottom 10% in another school!!!!
Come Wednesday (last exam) I am going to forget all about it until August 