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38 races probed for being too short

Marathon clock

Thirty-eight races in the north-west of England are being investigated by the Association of UK Course Measurers for being too short.

It follows three years of Greater Manchester Marathon times being declared invalid in April after the course was found to be short by 380m.

Courses are measured using a bicycle fitted with a counter to calculate distance by the turning of the wheels.

However, the course used