Interesting footage from Robert Gooley in his Evo on the H circuit showing that he hits the same speed around the back as on the front straight, about 210 which is around the speed that the Kink at Lakeside is taken by similar cars. Robert is pretty quick around Lakeside, his speeds would be understandably higher in an Evo than what a Zed could be expected to reach too.
So, looking at those facts, it's rubbish to say that the H circuit is too fast or whatever the safety problem is supposed to be. The other thing of course is that there would be much less local knowledge of the H so making it fairer for those who are not MP regulars.
Anyway, here's Robert's vid