Boot Central Locking Wires?

[quagmire 0]

The central locking in my 205 is fubard so im planning on fitting one of those universal kits from maplins. I know the boot central locking wires are numbered 200 and 201 but I can't find the yellow plug in the fusebox, Ive found the other half that it plugs into but thats it.

 

Ive checked the wires that run through the roof lining but the numbers on them are totally different (161 and 16b?) So where the hell do the wires go from the boot?