I think it is because the universities are beginning to price themselves out of the market by asking for ridiculous grades for their courses so exam boards need to up the grades so the students get in.
We visited Birmingham University yesterday and had a talk on Physiotherapy (daughter really surprised me there). The admissions tutor waxed on lyrically about the kind of person they wanted on their course and stated that the minimum grades requested would not be the profile, you would need much higher grades to get an offer from them. As we had not researched the course (daughter decided on a whim that she might be interested in it) I mistakely thought from the way the tutor was talking that the minimum grades required must be around BBB or even BBC ( not maligning Physios, but they are not doctors) How wrong can you be - ABB is needed - and that would not be enough for physiotherapy ?
My daughter will probably get ABB or maybe even on a good day AAB, but much more than that - well possibly if her marks are moderated as described above, hopefully she'll have a chance