Okay.
Thanks to SWMBO seeing how I had done it and exclaiming "You can't do it like that!" the set up has changed :D
Cables run up through the Driver side headlight cavity, with two small notches in the plastic cover allowing them to pass through to the battery box.
I've still yet to secure the control box, and as such some of the cables have a bit of slack however once it's all secured I'll cable tie them out of the way.
Cheers for all the input, I'll get some pics later :)
Muppet

