Well done Paul,
It's so upsetting when this kind of thing happens. It seems to me immobilisers are almost designed to prevent the rightful owners of cars from enjoying them. The chip fell out of my Plus 4 key in Italy and it wouldn't start. Thank God I carried the spare key. FYI the people re-programming my ECU for the Ecoboost conversion will delete the immobiliser at my request so it will always start with the key. I shall risk that the rarity of the Mog, the steering lock and my own "secret switch" will prevent theft.