Code needed for car radio PLEASE!!?

I have just paid £650 to get my car through it's MOT, and i get it home to discover i now need a code for my radio as the mechanic disconnected the battery.
I have several numbers which i haven't a clue what they mean.
Car: Renault Grand Scenic
Radio Numbers
Serial: RNRD0350266928
Model: RENRDW131-10
Prod No: FD0705070266928

There is also another number: 8200300858TT328

I really hope someone can help me!
thank you in advance