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@Greenbank
Not just the Manchester Marathon for those 3 years but a load of NW races were short too:-
http://www.bbc.co.uk/sport/athletics/36259171
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Courses are measured using a bicycle fitted with a counter to calculate distance by the turning of the wheels.
However, the course used to calibrate the bicycle wheel was short by 0.5%.
"
They obviously need a marathon length piece of platinum-iridium stored somewhere safely in France to do the proper calibration.