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TTM
Whereabouts in London are you? I can do a 20 minute test in two places in south-east London;
The A21 Gates Green roundabout to the Shampan curry house in Biggin Hill https://www.strava.com/segments/2348729
Corkscrew Hill roundabout to the B265 - can't find the exact Strava segment but continue this one to the junction with the B265 https://www.strava.com/segments/12841629
They are not perfect, as both have a couple of shorter downhills, but you can whack it into a big gear and keep the power on.