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My fastest km (and 400m, and 1/2 mile, and mile) according to Strava was due to a GPS glitch caused by running through the pedestrian tunnel under Westminster Bridge.
It'll be a considerable while before I'll ever be able to beat those times. (*checks*, it's a 4:03 km and my 5k PB is way above that at 24:12).
And I'll never ever get close to the 400m time:-
"Best estimated 400m effort (50s)"
Guess I should find the original fit file and fix it.
10k?