Was going to fit a new cig lighter socket as my old one was corroded on the metal contacts but realised the £2 generic one I bought didn't fit so decided to just swap the metal innards. While I had it apart I noticed the plastic yellow/orange ring was peeling away a bit, so off it came and smoothed it off. I was then left with clear plastic. I removed the original bulb and holder and put a spare 12v blue led in, stuck in place with some tape.
I also took out the original ashtray light and made a holder for another 12v blue led.
I wired both into the ashtray illumination plug. Looks much better imo.