Having just come off an 'Awareness Course' which thankfully avoided me getting points on my licence, OP (and again this is not without some sympathy and empathy, based upon your posts*) I think your arguments so far are wishy-washy, lack hard facts and are unlikely to melt the heart of a Magistrate who probably thought that sitting on the Bench was going to be more intellectually challenging than 'Oh dear, not another plea not to be endorsed'.
So when you appear, having I presume pleaded guilty(it is after all a strict liability offence) what would you say? I read the SJP notice that you can plead guilty but still request to attend court regarding which subsequent procedures and paperwork would follow i.e. you only have to decide whether to plead guilty or not by 5 Aug, not to have your 'not to be endorsed' argument set out in detail. Or is this not correct?
So, to plead guilty or not?
*- your posts appear to be at odds with Constable Sutton's witness statement where he says you claimed that the car was insured on a 'fleet' policy. I can't reconcile this with your posts here. IMO 'fleet policy' implies a company insuring vehicles and not, as here, a couple having two or more cars in the family, jointly owned but each with one of the couple as the insured party.
Two possible scenarios: two cars jointly owned but for practical purposes one is considered to be hers and one yours. One of the couple- in this case your wife- takes responsibility for these hands-on admin. tasks. You have separated since the last time the insurance on your car was renewed and she received an autorenew notice and responded by positively cancelling the insurance without giving you notice as some form of retribution, all of which happened a matter of days before you were stopped, possibly following a recent meeting to discuss relief and custody, or
The car's been uninsured for months and she told you about it ages ago because you had agreed between you, but not finalised that the car was to be yours.
I don't want to pry, but as has been posted earlier these issues are very fact specific. And I'm still not quite certain about the insured parties here. If you are/were the insured party then an autorenew notice would be addressed to you. From which must follow that you were not the insured party. So you were driving the only family car or perhaps 'her' car and she had cancelled the insurance before handing to you..or perhaps this is to do with 'fleet insurance'??
And by the way, what were your 6 points awarded for?