Started the car. No dash errors. As I have said, it only happens every now and again.
Decided to check the fog light per the comment above. It’s working fine, however the fog light is only on the rear driver side, whereas the Scanner software says left side. I presume this is irrelevant. I’ll look at pulling the fig light bulb out as that should throw a dash error and I can check what Scanner says.
Why is nothing straightforward…….