I know this is "old news" in the sense of the article appearing in the Guardian (though without any meaningful follow-up in terms of the publication of the promised review), but I've got a bit behind in my blogging recently.
But, to be brief and blunt, I am dubious that anything approaching a meaningful clearance has been, or will be, demonstrated. If the document he claims to have been sent actually existed, he could have produced it right at the start. It's hardly credible that he would have destroyed it after scanning.
That investigation is now complete, and the conclusions will be made public.
Two weeks later...tumbleweed.