I went to vw a few months ago to ask the same question. They told me that if I got it fitted they would provide the code for me. Worth doing that before spending £6
So some thieving git can smash your window, rip your expensive OEM headunit out, and have it in theirs for the grand sum of £6 !!!!!
I got a code for my radio of eBay for grand sum of 99pWorked a treat!