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I am a criminal barrister. I think I can help with this question however could you please clarify precisely what you want to know about bad character evidence.
The proceedure for bad character evidence (even in the magistrates' court) is to send a written application to introduce bad character evidence of a non-defendant to the CPS and court. This is necessary in all cases. Unless the CPS agree (which is highly unlikely) your lawyer will need to argue the application in a pre-trial hearing (which you will not need to attend).
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