This blog raised the question of Coulson's vetting. It demanded that Dick Fedorcio be called in. It demanded an audit of telecoms intercept logs.
So here's another question. A timetable for defence vetting processes can be found here. A request for developed vetting, i.e. a top secret clearance, or what Andy Coulson was meant to be getting when he quit, takes 70 days under normal conditions.
Now, we might want to know who told the papers everything was great to start with. Eh.
Anyway, if he was "undergoing vetting" in January as a result of a decision in November as the official line says, we can rule out the 30 day expedited process. There are too many days. But a date in the middle of November would hit off Coulson's resignation perfectly.