Heat Shrink is Ace!
I extended the wires to the relocated washer bottle this evening. For a change, I've done it properly with soldered joins and heat shrink tubing and it looks pretty good. The tubing was very easy to shrink, a minute in front of my little fan heater was all that was required.
Assembled the last strut too, ready for fitting. Looks like I'm drilling the sump for the turbo drain this weekend; I am afraid.