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You do realise I've done an extra lap in at least two of those Hillingdon '10's? You don't need to take a wrong turn to look like an idiot :)
I've done that.
Now I have my Garmin and check the distance.
One time I forgot I had left it on km instead of miles and, after about four laps I checked it and thought I was going really fast and had got into the zone where I'd done a couple of laps without realising it...
At least you had the sense to do yours 150 miles away where no-one knew you, I'm preparing for humiliation in front of half my club and about 60 west London cyclists. And at Hillingdon I can't even take the wrong turn off a roundabout and say I got lost!