A vehicle airflow control apparatus (900) has an air inlet (902) at the rear quarter glass (906) of the vehicle and ducting (908) leading via an openable joint (912) and rear ducting (912) past a bend (916) to an exit blowing aperture (918), a concertina element (928) allowing duct movement, the openable joint having a self-alignment cup (938) with wedging inner sides (944, 946), an interface seal connecting the rear ducting and the cup, a deployable spoiler (920) having a drive system (978), 10 outboard positional control of the spoiler being provided by a rod (998) with cone surfaces (1000, 1002).