Phillips Radio Decoding

[mowgli]

I've got an astra mk3 van at work, and one of the lads ran the battery flat. The prat then tried to guess the radio code??????????? and now it is stuck in safe mode. according to the book, it will take 320 minutes with the ignition on before I can re-enter the code. It is a Phillips SC201.
Any Ideas?

I am not going to put it in the freezer, the van is filthy & I don't want to get cholera.