Thank you both for your input and adopting your approach there must be a fault in the wiring somewhere as as I've pulled out wires for both switches individually and collectively and the lights stay on!
John 2016 GDI Plus 4
Just another thought. I have never looked at the footwell light on a GDI, but don’t suppose it has a manual switch to over ride the door switches like tin tops have, and it’s been accidentally knocked to the constantly on position??