Radio Code help!

[J60SON]

I have recently had my head gasket replaced (which took 6 weeks!!!) but in the process the garage disconnected the battery. I was sure I still had the little card containing my radio code, but cannot find it anywhere. Further more the car was bought from JCT Leeds, I have requested on a number of occasions if they could let me have the code but after repeatedly ringing them I have given up!
Does anyone have a clue how I would decode it or recover the code??
Help would be appreciated as it is very quite in the car now. :ah:
It’s a

CDR-22
Serial X 5011379

It also quotes various other numbers like
Becker 1
Type 4467
49/98
CDP 2065
Thanks, Jason