Report here.
If it's breaking the speed limit
per journey, it's maybe credible. But each individual instance of going above the limit and dropping back, I'm sure it's a huge underestimate.
Let's say I have a driving career of 50 years (and that will only take me to 67). I drive on 300 days a year, making two specific journeys per driving day, and exceed the speed limit on 90% of occasions. That's 27,000.
Now that my local road has been made a 20 limit, I exceed the speed limit on every single journey I make. Before that, there were some journeys I made where I could credibly claim I didn't.