Key arrived back in Australia today. One week after being posted from UK.
Thanks Tony. Thanks Royal Mail,
Thanks for the comments, here's some extra comments for anyone contemplating getting the remote to synchronise.
Postal service has never yet failed to deliver the goods - except once, on that occasion the postman in Bristol could not be bothered to climb upto some flats to deliver the item. It was returned to me 10 days later.
Paying for courier service is usually a waste of money, - they tell lies about their delivery time, its far quicker by mail service.
You do not need to send the whole key, just the green PCB inside. If it was to get lost a replacement can always be purchased s/h, and the key and car can still be used.
The processor chip on the PCB does sometimes stop working, I suspect the batteries fitted incorrectly could cause this.
The key unlock code cannot be read directly from the processor. A spare ( open) receiver is used to load the key. The eeprom from the receiver is read and the code is derived from that.
I can offer free unlock code from a dump of the eeprom in receiver, but be sure that whoever is doing the reading is a competant and tidy worker. Its easy to wreck a small circuit board.
Oh, and yes I have sent several to SA amd African continent.