Nothing that Andrew Haines has said expressly shuts the door against the more than likely possibility that the CAA will move fairly smoothly into transition mode. The CAA have had - in one guise or another - 80 plus years to acquire the aviation administrative skills necessary to see them thru' Brexit transition. That's about seven or eight times longer than EASA have had to make their presence felt.
It is said that Andrew Haines has been wearing for sometime a rather pained "I don't believe it" expression on his otherwise cheerful countenance, isn't because he's suffering from piles but simply because the shock of the Referendum and its likely impact on the CAA is still registering. Who, could have foreseen it ? The 'elites' certainly didn't.