Hi Paul, the guy's name is Roy, I shall PM you his address.
According to the 3A sales brochure that I have it came with a new instrument cluster, column switches and fusebox. Roy suspects that the cluster and switches are from a Fiesta, definitely not Sierra, which probably means that the wiring is completely different to the Sierra column switches!
I think the 3A came in a couple of different configurations, inboard front shocks, outboard front shocks, loads of extras that did not come with the 3: servo, discs, callipers, air horns, instrument cluster, column switches and fusebox.
He will be very thankful for any info you can send him.
Cheers,
Nigel.