I agree that criterion 2 of Policy WK2 refers to the general area within which Brands Hatch is located - I was meaning criterion 3: The proposed development should be appropriate in scale and character to the existing uses or buildings. I think it is arguable that the proposed changes to Graham Hill bend are inappropriate in character to the existing circuit. I'm not sure that I would want to hang my hat on that as a defensible reason for refusing the application but it might be enough to justify a Sevenoaks councillor calling for it to go to the committee for determination. (provided you could find one who was sympathetic).And a very sensible reply it was. The only point which I would question was your interpretation of the Council's policy point 2 re the 'character of the area'. I am sure that by this they mean the overall environment - a partly wooded, partly open and grassed area, which happens to have a race track in it. I doubt very much that they care at all about the exact layout of that track - and indeed, why should they? I don't want Council planners telling us how to lay out race tracks. We are regulated more than enough already, which is why I am chary about using planning authorities as a weapon against MSV.
As for getting English Heritage involved, that could also prove a massive own goal. If we ended up with a listed, protected Brands Hatch, it would be almost impossible to ever make any changes to anything there in the future; it would be preserved in aspic for future generations, but as a museum piece, not as a living, working, financially viable race facility.
I also agree with you that achieving some form of protected heritage status via EH would be a rather dangerous sledgehammer to crack a potential Kentish filbert. Brands Hatch's future as a racing circuit depends on it continuing to be commercially viable and that requires the ability to adapt and change it to meet current requirements. However, I don't like the look of the changes proposed in the current application and I feel sure that there must be other, more sympathetic ways of achieving the (apparently) desired result - a corner that is "fast enough to be a real challenge on a Superbike or slow enough to be a place for a safe overtake".