R Reg Nissan Micra Radio Code?

Hi

Would anybody be able to supply me with a radio code for my Micra - I've lost it with a recent battery change and as the car was bought s/h, I do not have the original documents.

The Numbers are:
BP6340T3205533
7 646 340 318

I'm just giving this a go before giving up and having to buy a new radio/cd.

Thank you very much in advance for any help you may be able to give me