Hi,
There are 3 ways you can get the radio code:
1. Reference your car manual or the Grundig's manual that came with the unit. Most times, there is a sticker on the manual with the radio code printed;
2. Call/visit the car dealer and explain your issue. You may need to show proof of ownership of the vehicle and/or the radio;
3. Use firms who specializes in this. You can try
here,
here or
here.
If the Grundig is the original radio installed when the Vauxhall Astra was new. there are some unconfirmed reports that the radio code is also stenciled on the metal plate where the Vehicle Identification Number is.
Hope that this be of help/idea. Pls post back how things turned out or should you need additional information.
Good luck and kind regards.
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