Yes, but are you confused as to why the police haven't accepted your story, or because everything you have told us is bang on the money and the Police has decided to attempt what appears on the surface, a prosecution that seems to be too short of evidence to succeed?
You say the offer of a course was replied to as 'recipient gone away' as opposed to earlier when you said it was 'not known at this address'.
Is the 'driver has gone back to their home country card' being attempted here? Presumably you are in contact with your friend still as you had an argument about you receiving a SJPN. Are they still at the address they gave on their nomination?
I would plead not guilty. It sounds as though there is very little evidence to support a failure to furnish charge on you, plus you weren't the one speeding.