Lenny wrote: 18 Dec 2018, 20:46 I'm toying with the idea of putting a separate bright but compact light under the bumper down near the towbar and feed it from the towbar wiring.
I use a small halogen lamp on the 2cv and it works a treat.
Technically illegal -- the Road Vehicle Lighting Regulations specify no more than 2 reversing lamps are permitted. The other kind of white light you can have at the rear is a work lamp used "to illuminate a working area or the scene of an accident, breakdown or roadworks in the vicinity of the vehicle to which it is fitted."
There are also registration plate lamps, but these are prohibited from directly emitting any light to the rear of the vehicle according to the required type-approval spec.