I recall my BL cars, Dolomite, Marina etc, needed a clothes peg to keep the choke open as the twist-hold function had long since given up the ghost! Cars these days are so easy.
To jennijaz, the car will be on fast idle until it warms. IIRC our Jazz has a blue light on the dash that lights up when the engine is cold, and goes out once warm. Normaly taked a mile or two to do so.
Is the Jazz your fist car btw? Fine choice imho. I think we could do with a photo!