I just added my Wiring Kit (Pulse Width Modulator) to my Clubman today.
Just wanted to pass on the color codes because it was a BIG confusion issue for me.
Right Turn(Passenger side) Grey w/Purple stripe
Left Turn(Driver Side) Blue/Brn Stipe
Stop/Brake Yellow/Black stripe
chassis ground
Power Connected to Power Port (Cigarette Lighter like port)

I actually ran the above wires to a Male/Female plug, so the Modulator could be removed when not in use.
The wires run into the compartment by the Spare tire, and when used i hang the wires out under the Left Barn door.

Post some pics of the install as people ask me about this all the time.