I got myself a multimeter yesty and it looks like there is a short in the neck pickup pot, but I am not certain.
Might pull it all apart again on the weekend for learning experience as I got a better soldering iron and smaller diameter solder.
What I am waiting on is this Belcat active circuit:
It has a circuit diagram, what I want to check is that the pup hot connection goes to the centre pin on the respective pot (ie Neck=Bass and Bridge to Treble) using the kit humbuckers: