Unlock code for 2006 Micra C+C

Hi all,

I've just inherited this car from my Nan and after replacing the flat battery, of course the radio wants a code. No details recorded anywhere.
I've taken it out to get to the label:

Blaupunkt BP 5384 6 9494356
Nissan MMR CG-G 7 645 384 318

Can anyone help please?