Free Traffic Legal Advice

Hi everyone,
I need some expert advice regarding a NIP I received from North Yorkshire Police.
Location: Bondgate, Helmsley
Alleged offence: 36 mph in a 30 mph limit
Direction of travel: Travelling outbound (leaving Helmsley towards the 40 mph zone)
Laser distance shown on the image: 347.9m
According to my measurements on Google Maps, the mobile speed van parks at its approved site near the Linkfoot Lane junction. If you measure exactly 347.9 metres from that position outbound, the measurement point falls more than 50 metres AFTER the 40 mph speed limit signs (past the central island traffic splitter).
Furthermore, the photo provided by the police shows my vehicle already on the bend/curve of the road. The 40 mph signs and the traffic island are completely missing from the frame, which proves they were already behind my car when the laser was fired.
It seems the operator targeted my vehicle after I had legally entered the 40 mph zone, but the ticket office is processing this automatically as a 30 mph violation based purely on the van's parking position.
I have already named myself as the driver, and I have now received the conditional offer/course option. I strongly intend to take this to court (Option 3) because the technical evidence proves I was in the 40 mph zone.
Could someone please double-check these coordinates and advise if my defense is solid?
Thank you in advance!


Links for the photos:

Screenshot of the location is pointless - a GSV link would potentially enable us to perform a sanity check to determine whether the distance is consistent with the talivan being sited at the "approved" site.

I would dispute the assertion that there is no such thing as an "approved site", and replace it with the assertion that "approval" is essentially meaningless.