Presumably you were above the usual speed limit +10% +1mph usually applicable to speed cameras?
Robert, Cambridge by any chance?
I recently left Rothwell, quite late at night, towards the A14. I became aware of a vehicle following me, a safe distance back, within the sharp bends and 30mph limit and again in the 40mph section. I didn’t slow at any of the bends in the town.
I was minded to think it was plod, so waited and booted all 300 horses immediately after the derestriction marker. It caught me up, after I settled the cruise to 69mph, and followed me into Kettering. It was plod. But put simply, if one sticks to the speed limit, one is safe from speeding fines (but not necessarily other offences).
I don’t know the tolerance allowed in average speed restrictions. Anyone know?