Wee update..,found a black wire on the '-'ve that I had put on the positive. Since swapping this round I now have lights, fans, clocks, computer etc but still no fuel pump or ignition.

Having checked everything else there is a red/black wire that comes out the main loombelow the rad but does not connect to anything obvious. This wire is accompanied by the blue wire which connects to the other blue in the starter to alternator loom. Does anyone know where this red/black is supposed to go?

I have a sneaky suspicion it is supposed to join a single black wire which goes back to the fuse box but it is not long enough to do so. This single black wire is wired up to my fans and is presumably the '-'ve.

I don't have a multimeter yet to check.