How do you unlock the cd player in a Vauxhall Mariva?

I have no unlock code and Vauxhall are charging a fortune to do it for me. It's a 53 plate if that helps. Thanks in advance.|||Each unit has it's own code. You'll need to apply to Vauxhall for the 'Car Pass' (something like 拢15 to 拢20). This will have other important info on it as well as the radio code. Key numbers, security codes for the immobiliser and the like. Handy should you ever need to purchase replacement keys.