Ok so the simplest thing and the car is working again. Foot on brake, other foot on gas, press the starter button and RRRRAAAAWMNNMMburbleburbleburble!
It sounded a bit flooded. Anyway, next time I'll give it some gas for my next attempt if it is hiccuping.
I've to take the car up to Simon Norris soon to look at some of the small fuelling issues I've reported (light load pinking when hot), and this cold weather thing.
Phew!