I haven't cycled in that area for years but wouldn't keeping up a constant speed of 18/19mph in some areas during busy times on any sort of bike require a potentially more aggressive form of riding which could attract their attention anyway? I found in Reading when I rode a fast tourer that 18-20mph was only feasible in quieter parts and even in East Anglia I have to slow down in town....In London there's a lot of bobbies whp are keen cyclists and a lot of them ride a bike round their beat, I expect they can see the difference.
The cops and VOSA regularly do this sort of thing on the A12/A14 round here and also swoops on the "gary boys" you get in car parks..I believe that if a copper thinks a motor vehicle has been tampered with to make it illegal they can get it tested or at least issue a rectification notice that has to be stamped by a garage to say the vehicle is road legal, some may call it summary justice for minor offences.
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