Whether the then Times Athletics Correspondent, Neil Allen, still believes it was “the outstanding British athletics performance of all time” is something I will have to ask him on the next occasion our paths cross.  But what can be safely said, 47-years to the day after the performance in question, is that David Hemery’s achievement in winning 400 metres hurdles gold at the Mexico City Games of 1968, in a world record of 48.12sec, is a diamond that will always adorn Olympic history.