David Davis: what, no scandal?

I was at the BBC when the news of David Davis’ shock resignation started to filter through. Speculation was rampant prior to his 1pm announcement. There had to be a major reason for the shadow Home Secretary to relinquish his job. If you believe the opinion polls it looks as if he would have had the real job within a couple of years. As I listened in to the hacks and flitted around the political blogs on my mobile it was clear that this was a Big Story.