Possibly not, but what the court will consider is whether the error renders the NIP incorrect, that is to say is it enough of an error so as to prevent the OP appreciating the time, date, location and nature of the alleged offence, which is the purpose of the NIP and particularly the 14 day rule.
If the OP could persuade the court that when he checked that grid reference on his map, he was completely in the dark as to where he had committed the alleged offence, then he may succeed on the basis that the NIP wasn’t compliant. Given that he does seem to know where it was and this appears to be a simple typo that has given a location to the side of the main road where he actually (allegedly) did it, he might struggle to do that.
If the error was along the lines of ‘on the A69’ not ‘on the A66’ then that is a completely different location. A strategy in those circumstances would be to wait until the 14 days had passed, then inform the police that you can’t name the driver because you weren’t on the A69 at that time/day, you were on the A66. They can send you a new corrected NIP but of course that won’t comply with the 14 day rule.
There is no black and white, but in my opinion, and that’s all it is, the case in point is too trivial an error to make this NIP incorrect. In the same way as an NIP addressed to ben2709 not bren2709 would be ok, whereas an NIP to gatling9536 instead of bren2709 wouldn’t.
All this of course assumes what he’s got is an NIP.