Look in your book pack (black folder), inside the flip up should be a plastic card detailing your vin num, radio code, colour code, interior code and key code
Your Vaux dealer may have the number on their system already, have you asked them?
They can send away for a new 'Car pass' as its known, but will cost around £60
The newer cars need the Vaux techs to code any new keys so Vaux can keep track of how many keys are being sold and obv for security reasons.
The code simply lets us techs program the key, so that not any old joe bloggs can do it.
im assuming you dont need the key code to order the key itself?? just to code the key once ordered??