Hi Ralph & Simon, Rotary switch had me intrigued enough to go searching for what was available and not much out there that would either fit in the cavity or easily do required job.

Been a bit busy with work and other chores to have a clear enough mind to get stuck into this again. Without too much effort it can be configured in a simple coil split mode, just need to experiment to work out which wires go where to split to the better sounding coil. My guess is the coil towards neck will give a more lower mid to deeper sound. Will probably muck around with this before tackling Weirdy's suggestion just to get a base reference for how things sound and ultimately which is most pleasing to the ear.