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Ah, just had a look at my PR of that, it was back when I was about 7 or 8kg lighter than I currently am and was on a morning commute, riding my fixed gear, so would've been 48x15 gearing. I like climbing on fixed.
I like the seven sisters road climb too, set my PR on fixed gear there too :)
Basically though, they were roads I rode pretty much every day for 3 years, so eventually everything would come together and I'd get a nice run with a tailwind and no traffic, no red lights etc.
That'd be me!