evening mk2man1,
I might be able to answer this one.... but might not be conclusive

I have recently purchased a Mk3 Gti8v.... The car came with one key.... and it looked like the spare key at that.
This key did not open the doors, but operated the ignition. It also came with an immobiliser fob, so i suspect the Fob has been used all it's life for the doors... and the key in the ignition.
So i think the door locks are mint (and need a good key) and the ignition and key have worn down together over time.
As I have the spare key I to thought it might not have a transponder....
I was lucky enough to get the original Owners Manual with mine.... in the back the Dealer or original owner placed a sticker
"To obtain a copy of your key mention the relevant number"Called my local dealership.... V5, Driving Licence, Util bill -------> £25
...with the risk than if the car as been broken into it might not fit any of the barrels on the car.
A gamble I wanted to take.
One week later I have a VW Branded key with light!!!

It does have a tag on it "MIT TRANSPORTER", yep you know German "WITH".
the Parts guy said I will have to book a session to code the key.... I have not tried the new key yet as the car is about 50miles away..... I will let you know how much once I have tried the key turning the locks
Hope this helps.
