Free Traffic Legal Advice

Thank you Andy. So what could it be that theres such a big difference. 18 miles is a lot. At the beginning I thought that maybe the camera was set on kilometres by mistake but in not sure if it's got 2 functions for km or miles. I wouldn't even consider fighting this if I knew I was speeding but as I previously stated there where evident things( the 4 people in high vis observing) to make you "aware" that there might be a possibility for police officers being with camera. And I was towing the mini-digger downhill so depending on how far he was there is a great possibility that having that speed and the distance between me and him I physically wouldn't be able to stop.  I'm not sure what to do now as pleading guilty while driving in a legal and safe manner has been haunting me for days now.  Had driving license for over 9 years and never been caught speeding

Thanks for the advice so far. I’m trying to make sense of a huge discrepancy and would appreciate your technical take on it.
 
The officer alleges 47 mph from a front-on handheld, but my raw Google Takeout logs (the JSON telemetry) show a  speedMetersPerSecond  of 12.96m/s at peak, which works out to about 28.99 mph. The log also shows a high accuracy rating of 3 meters.
 
I’m not a tech expert, but an 18 mph difference seems like a lot for a GPS error. I’m a bit concerned that it will just be the officer's word/device vs my JSON data.
 
I wouldn't be debating this if I thought I was speeding, but I know this road well. In fact, at that exact moment, I had just exited a roundabout where there were people in high-vis green vests taking notes, which made me even more conscious of my speed.
 
Is it possible for a handheld to have a 'slip error' or misread that could account for such a large gap (from 29 to 47)? Or is the court likely to just ignore the GPS data entirely because it’s not an 'approved' device?

Contesting 47 in a 30 (Band B) - Forensic GPS contradicts Police Allegation
 
Hi everyone,
 
I am seeking advice on a potential "Not Guilty" plea for an alleged speed of 47mph in a 30mph zone. I currently have a clean license (0 points) and want to protect it.
 
I have a significant discrepancy between the police allegation and my phones verified GNSS (GPS) telemetry for the time of the stop.
 
The Case Context:
 
1. The Allegation: 47 mph (Band B).
2. The Setup: I was towing a heavy piece of plant machinery on a trailer.
3. The Road: A downhill gradient with a very short total journey distance (~800m/ 0.5 miles).
4. The Evidence: I was stopped at the roadside (front-facing laser)shown 47mph. I have been told over the phone that no photographic/video evidence exists.
 
The Telemetry Data (3m accuracy):
 
- My peak speed for the entire journey was recorded at 12.96 m/s (approx 29 mph).
- At the timestamp provided on the police documentation, my telemetry shows the vehicle had already been fully stationary (0.0 mph) for over 30 seconds.
 
The Proposed Defense:
I believe the 47 mph reading is a technical error (likely "Slip Error") caused by the combination of the downhill slope, the vehicle pitching under braking, and the complex reflective profile of the heavy equipment being towed. Furthermore, there appears to be a clear time-synchronization error in the police log.
 
Current Status:
The Justice Unit has declined to review this data at the Conditional offer, stating that evidence will only be provided at court.

The Conditional offer doesn't state the speed I was doing.

I've sent an email with screenshots showing the speed I was doing on the stretch of the road from exiting a roundabout , mid point , just before turning left to a side road where I was pulled and stopping time.

 
I am prepared to go to court to keep my license clean. Does this level of telemetry (3m accuracy) usually carry enough weight with a Prosecutor/Magistrate to highlight a technical error? Are there specific "procedural" questions I should be asking once I receive the SJPN?
 
Any advice would be greatly appreciated.