Hi Sospan, I think this is going the right direction, but how can you check this?
I read in a Ford-related website that they have an immobiliser light showing whether a key was properly identified (
https://thecarkeyman.co.uk/ford-car-key-problem/)
Since the 4/4 uses Ford electrics/electronics there may also be such a light in our cars? Maybe somewhere under the dash?
Is somebody aware of such an LED?