According to wiring diagram the power to washer pump for corresponding stalk switch action comes from light green/black wires from switch feeding washer connectors for both left and right hand drive versions (common main loom). The corresponding (slow) feed from stalk switch being on a separate wire to wiper motor. However those diagrams have been proven to be very inaccurate in that area.
What does seem to be accurate though are the wire colour codes for those at the wiper motor loom connector since they follow current standard Lucas codes:
red/light green - slow
blue/light green - fast
brown/light green - park
black - motor ground
green - constant (with ignition on) +12 volts to allow parking with wiper switch off.
