I'm tempted to say the colours are:

Black/White - Goes from the ignition barrel to the ECU and start solenoid.

White - Goes from the ignition barrel to the fuse box under the bonnet.

Yellow - Might have the yellow and blue the wrong way around but goes from the ignition barrel, splits into 3 and goes to the cabin fuse box twice in 2 different locations and to the fuel pump.

Blue - Goes from the ignition barrel to the cabin fuse box.

I need to confirm the colours but they may change after the connector and the yellow and blue may not be yerllow and blue lol, i'll check once i'm home.

But my question is what is the function of each of the coloured wires, i'm in the process of wiring in a starter button and ignition switch for my track car and just want to know what's what and they are doing in regards to the key position 1 2 3 4.

I'm thinking yellow is position 3 as this is when the fuel pump primes.

Thanks