e Mail sent with wiring diagrams which may help.
Wiring from the front of the car to the rear normally goes along the top of the car under the headlining, down to the rear parcel shelf where there should be a connecting block on the left side of the car just under it to distribute the wires to either side. Well it does on my French car and I don’t see why a Slough car should not be the same unless anyone knows differently?
David Faulkner