I think the cop's point was that you already had a least 3 demerits for speeding from 2005. If you plead guilty to not stopping at the stop sign, that will be another 3 demerits or 6 demerits in total on your record until some point in 2008.
If you plead "not guilty", the 3 new demerits won't appear on the MOT abstract until after your trial. Even thought the insurance company keeps records for 5 years about tickets *they know about*, the MOT driver's abstracts only go back 3 years.
This way, if the insurance company does a random check, only one conviction will appear in your abstract at a time to possibly affect your rate (assuming that they didn't find out about the first ticket already). If you plead guilty, there will be a period of time where 2 convictions will appear.
The object of the exercise isn't to be found "not guilty". The object is to delay being found guilty until after the first ticket disappears from your record.
This trick used to work a few years ago to keep points off your record for insurance purposes:
1) Plead not guilty. The first trial date will be set about 6-8 weeks from now. A few days before the trial date, ask that it be postponed due to an "illness" in the family or whatever. Two things could happen:
a)Because you asked to be postponed, there's no obligation to give you a speedy trial and they'll set a new date a up to a year later.
b) They will decline to postpone the trial. Have a friend go in your place, but remain "quiet" to see if the cop shows. If the cop doesn't show, the friend comes forward and presents your case since you aren't present because of the illness that you previously informed the court of. If the cop does show, your friend stays "quiet" and you get convicted in absentia.
2) Assuming you got convicted in absentia, go before a JP and explain what happened. Tell him that you had informed the court in advance to try to delay the trial, but couldn't. You truly believe you were innocent etc, etc. If it sounds reasonable, the JP will schedule a court hearing to see if you should get a retrial. The hearing for a retrial will be scheduled about a year later. The conviction won't appear on your abstract because it is under appeal.
3) At the hearing before a judge, explain about the illness; how you tried to inform the court in advance to get the trial moved but couldn't; how you couldn't get someone to represent you, etc, etc. Remember, this is a hearing to see if you should get a retrial, not the retrial itself. If you sound reasonable, the judge will grant you a retrial and set a date about a year more into the future.
4) At the retrial, it's been more than 2 years since you got the ticket so there's a pretty good chance the cop won't show (moved, quit, etc). If he does show, do your best but in all likelihood you will be convicted and pay the fine plus some nominal court cost.
5)If you timed this properly, 3 years has already elapsed, so the conviction won't appear on your abstract anyway and there's no insurance rate increase. You've won the war, even though you lost the battle. That's why you really don't need Points or XCoppers.
So you are out a few days pay, the fine and court costs vs. the insurance rate increase. You have to decide if it's worth it all.