Upper Middle Petrol Head:

Yes.  I agree.  We are getting a little ahead of ourselves; installing accessories does, more often than not, come towards the completion end of a project.  However, I'd generously been given a set of vintage Cibie 91I driving lights - last fitted to mate Mark Drury's long-gone '70s Mitsubishi Lancer hatchback - and was looking for an excuse to muck about with P3P. Luckily, thirty five-plus years in a box had been kind to the lights, which came with clear, chip-free lenses, almost completely unblemished reflectors, perfect plastic cases and two pristine black covers with Cibie logos printed in a chrome finish.  I guess this shouldn't be a surprise, though; Mark's training as an architect clearly informs his almost archival approach to storage.  FIRST THINGS FIRST: GETTING THE LIGHTS WORKING ... The thing is, one of the lights didn't work and a faulty bulb wasn't to blame.  Closer inspection revealed that organised and dry as Mark's cache may have been, t