RIP
There does not need to be a witch hunt, and if there is it'll be as a result of Nanny State Britain, (actually, I'm surprised that the Gov't hasn't already outlawed motor sports here as being 'too dangerous', going by their record of banning everything remotely dangerous). I have a hunch they'll try to find a way to fine Brands Hatch, but it's not needed, it was a freak accident, and nobody is to blame in my view.
EDIT: 5haz just nailed it perfectly, he summed up what I was saying, and agreeing with.