Yes, those bloody average speed cameras are a nuisance, and yes the course was even informative. I learned that my reaction time is still the same as it was when I was 20, much to my surprise. And some clever tips about watching the line of tall street lights to predict bends and dual carriageways in advance in urban and suburban places.

Although any average speed camera can calculate average speed by reference to any other speed camera, watch out for the ones with TWO cameras on the same stalk. Those are focussed fractionally differently so they get your average speed over a distance as short as a few yards...