ok, here is an update:

this is what some of the better parts of the wire looks like



as you can appreciate, it's not good so i've gone and got the bits and bobs to wire it up properly



and



but none of the colours seem to match up, like so



so what do i put where? factoring in that i need to use the split wiring to wire into the main junction box, then i can put the extension wire to the new point, which i will need to wire up again because it's not got a hole to simply plug into the back of

and, further to these problems, i'll need to run some conduit to put the wire through which is proving harder to find than a cheap house

i've got 6mm to play with and after that i'll need to channel up the concrete floor, which will mean that the mrs is going to go more bonkers than the airline industry when it comes to bits of dust going all over the place