Tim I also fitted an Autosparks loom 18 months ago, but to my Land Rover. Being a diesel conversion from original petrol engine, I ordered for the latter expecting some redundancy but with voltage regulator wiring correct as mine retained the petrol one. It arrived with some non original additions, reversing light wiring for example, although easily identified as it followed BS colour codes. Some redundant wires were re-purposed and others just taped off.
If Autosparks cannot offer a more appropriate loom then would suggest you work as best with existing Autosparks one. A greater number of fused circuits would be a step in the right direction and a new fuseholder also a benefit. Extra cables for coil ballast could easily be added.
