
I had a good check around all the electrical connections under the drivers seat (and there are a lot on the exec) and without actually finding a 'loose' or 'bad' connection I had fixed the problem and the Air Bag light stopped flashing.
So, I don't really know which connection was at fault, only that I went round them all, pushing them tightly together and it worked

There was only really one 'iffy' connection thinking about it, and this was right at the back of the seat base where a rear seat passenger could catch it with their feet

Anyone else know?