Richard I am on my second PCB. They are cheaply built and wat too complex. I love to find someone who can build a simpler solution, by passing as much from the board as possible.
When you say PCB John do you mean the whole switch with lead and plug or literally just the PCB part which would require a fair amount of re-soldering into postion? The parts book suggests just the complete switch is available, no individual parts.
Would be happy to investigate a replaced one if its deemed U/S, as I'm sure some parts would be salvageable.
ETA: my comments referred to the momentary switch type used to control front/rear fog lamps, heated screens and possibly air con., where they just offer a toggle on/off signal to the BCU, and introduced to Roadster and +4 models in 2014. I'm sure the PCB's on earlier types could be bypassed similarly though.