Identifying the precise moment when the country’s regression towards developing-world status started is beyond me - and possibly beyond those far cleverer than me (not, admittedly, the highest of bars).
But I have the nagging sense that this downward trajectory, which barely perceptibly began aeons before Brexit and has accelerated into a corkscrew spin, started when motorists came to regard the deployment of indica tors as beneath their dignity.
The theory will lack strong support from both the relatively sane and left-leaning historians.