Nigel you will shortly have mail, Chris thanks for that advise. My next move will be to draw out the RHE loom full size on a 9 foot wide roll of photographic background paper i'm even considering doing it in coloured pen. Then i will start on the sierra loom.
The loom (or half loom) i have does not match any of the sierra loom. It has Brown earths, Red main un switched power, black switched power, white and yellow main and dipped. a variety of grey/black red/yellow green/black some wires are connected to fuse box/ column switches and light, ancilery etc. other leads of the same colour seem to have nothing to do with that function.
Would still appreciate any info and diagrams