Kabooooom! Oh yes, we expected fireworks. What we didn't anticipate was a full-blown mushroom cloud. Dominic Cummings' evidence to MPs yesterday was shock and awe. A highly-enriched, weapons-grade display of exploding phosphorescence and toxic fall-out which rained down over Westminster for seven and a half extraordinary hours. Never before in select committee history has such a senior Government crony gone so spectacularly rogue. Over the course of this marathon session of the science and health committees, the Prime Minister's erstwhile eminence grise torched Boris, bazooka-ed Carrie, ridic...