John hi ,sorry to hear you are having a few teething troubles . One of my Mk3's came with two remote fobs with only one that worked ,fitting a new battery made no difference so I used the following method to reprogram the thing to the car . It seems a bit of a faf but actually worked first time .
1. Start with key out of ignition, drivers door is open all others closed and drivers door is unlocked. 2. Insert key into the ignition (Do NOT Turn) and Pull key out. 3. Perform these steps within 40 seconds. A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles starting with lock. Use an even pace and try to go about one cycle per second. (1Cycle = 1 lock and 1 unlock). B. Close, then open drivers door. 4. Perform these steps within 40 seconds. A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles starting with lock. Use an even pace and try to go about one cycle per second. (1Cycle = 1 lock and 1 unlock). B. Insert the key in the ignition cylinder. C. Turn the ignition to ON (Do NOT Start) then back to OFF. D. Remove the key from the ignition. 5. Press any button on remote for a minimum of 1 second. System should now lock and unlock doors once. 6. Close and open drivers door. 7. Press any button on remote for a minimum of 1 second. System should now lock and unlock doors. Once to confirm programming, twice to indicate programming failed. 8. Repeat steps 5, 6 and 7 for additional remotes.
My valet key starts the car and locks unlocks the doors ,it wont open the glove box or the boot .
The owners handbook says about the radio code, if the code has been set on the radio unit you will get SEC show up on the display for a moment when you turn the ignition key from OFF to the ACC position .It seems to be rare for them to have a code set .
Enjoy your new car .