It's no longer available via eBay. Here is another source:
http://www.mez.co.uk/lucas.html

ROTFLMOA Got tears coming out of my eyes.

I used to own a british car with Lucas wiring. Triumph TR4a

Ever, perchance, have a grounding problem wi that wee beastie, Karl?

i owned that car four years. it was under repair for two of those
years. AND it was my only car. I about split a gasket over the
official lucas three way switch - dim,flicker, off. I put in all new
wires for the starter and iginition. The rest of it normally didn't
run.

karl