Number 10 is dealing with wholesale departures from its civil service spin team. Last month it was revealed Theresa May’s highly-respected official spokesman Helen Bower is leaving to run comms for Boris at FCO. Today it emerges the deputy PMOS, the popular Greg Swift, is off to spin for David Davis at the Brexit department. There is fevered speculation tonight that Daily Mail political editor James Slack is being tapped up for the PMOS role, though there is nothing in the way of an official announcement yet. Sure the No. 10 comms team has been a joy to work in over the last couple of weeks…