I don't believe in the media conspiracy that the Tories created an algorithm that systematically awards higher grades to rich kids because of inherent classism or even by accident.
But I do really disagree with the insistence that all teachers in comprehensive schools were conspiring to give their kids higher grades than they deserved -- this view was frequently repeated on social media. Even if there were some that were doing this and it was apparent from the statistics, teachers are not a homogenous group and there are many teachers that take fair grading very seriously and even take enjoyment in being tough markers.
I don't know the data but my own worry is that this will have hurt the high variance or lazy kids that won't normally get high grades but would normally settle down and revise hard for such an important exam. I hope that these kids will be given the opportunity to resit the exam for free, since I doubt an algorithm could capture the variance that exists every year.