For boot light the wiring is stright forward, but you need a tailgate latch with a switch, or you can put a switch in the boot somewhere. I was using a stick on light from poundland which i stuck under parcel shelf. But i just bought a boot latch with switch.
To wire it use the latch swith to connect to earth, so when boot opens the earth is connected to negative side of light bulb or LEDs. the positive is connected to positive side of bulb/LEDs.(You can put a switch anywhere in a circuit, it doesnt have to be on a live wire).
I am hoping theres a permanent live wire somewhere in the connector for tailgate loom, i havnt done it yet.
I am just researching how to get a wire down the tube into the tailgate? Im assuming i can just pull the cover back to get access to wires and connectors? Havnt looked at it yet.