I like the observation from Yogui of the point you get to when the needle is moving up. Mine is the pond by my local pub, and the needle going up is accompanied by views of ducks and thoughts of beer, all positive (unless you hate ducks).

I drive immediately, as per Phil. And my choke is used only to start the car; if it's on at all, even in the first few minutes, it makes the engine bog. The idle is not adjusted properly to make the choke raise the revs to stop the bogging, but thanks to the Board I have a good idea how to adjust it, when I get the time and the daylight.

Tom