Brake light switch wiring

Can someone help me, I have no idea where the green and green+purple wire comes from for the brake light switch.
I trace the G+P wire up from the rear brake lights and the wire goes into the mass of wires near the fuse box but then i lose it.
So please could someone, who knows, explain where I can find the wires. The green I take it should be live?
If any one has a picture of the locations of either wire it would help.

Thanks
Jasper

From the switch, the green is fed from a fuse. If you take the fuse cover off, it should have a little diagram to show you which fuse supplies the switch. The green/purple will run into the wiring loom to the rear.

Found the they (I) had cable tied them to the main loom hiding their ends and colour...