Land Rover Repair: Freelander ignition circuit, deep cycle battery, fuse box

Question
I recently bought a fast charge kit that will provide increased amps to charge a portable deep cycle battery (direct current via thicker wires) in my 1999 2L diesel Freelander.  The kit has an on/off switch to disable charging when the ignition is off, and has a single wire that needs to be patched into the vehicle's ignition circuit to enable this function. Which is the correct wire to patch into (I assume somewhere in the engine bay) or otherwise in the fuse box?

Answer
In the inner fuse box (under the steering wheel), there is an 5 wired brown connector (top of the fuse box). In that connector comes the ignition wire directly from the ignition switch on the thick green wire.

In the engine bay there are few places for ignition power supply, but they not as unambiguous.