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I've seen a similar woman a bit further west, perhaps it's a common theme:
Sprightly lady in her early 60s, commuting on a hybrid with a basket. Maintaining a good pace despite her sandals, but generally riding like a complete arse (forcing herself through every gap that wasn't there) and then berating any driver who got in her way, even if they were driving perfectly reasonably. Generally the kind of cyclist you feel you need to apologise for when you pass the car after them.
Where was this?