So, when you turn the ignition switch to 2nd position, not a single accessories (light or any 12V attached to the system) is on?
Totally no juice ?
The 2nd position switch (ignition key) should be connected to the main in order to power up all your accessories, the ignition system, the cluster gauge and all.
If you can poke under the steering and test the juice of the wire at the 2nd position switch, you can follow that wire all the way to the engine bay
and troubleshoot from there. Usually the Brits uses big 12ga brown wire for +12V....U.S. usually use red wire.
The 3rd position is for cranking the engine, No need to test the cranking wire if you don't get any juice at the 2nd ignition switch position.