Slighty urgent electrical help needed please

I'm half way through fitting a towbar and only have the electrics to go. I think I have found the white plug in the RHS rear cluster only problem is that my local RR dealers are shut and I need to finish the wiring today as I need to move my boat pm today!!
Can anyone tell me which colours wire does what as they do not match the standard 7 core cable then I can bypass the exsisting socket.
Thanks in adavance

why not check the colours at the actual lights or use a multimeter/testlamp to find out what does what?