My Lucas parts book gives the following:

Aux/blank switch (bottom right) 35947A (Guy Arab bus!)

Heater: 39119A/38723

Screen wash: 39116A

Lighting switch: 35870

Windscreen wiper: 31836F/31780 (believed to be Mini Cooper)

Hazard: 35888A/39846/39687A/38726A

Arwyn