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A decent effort around the airport is about 8 minutes so I use it for VO2 Max intervals.
https://www.strava.com/segments/5697915There are a couple of traffic lights but every other lap is usually uninterrupted. It's not perfect but it's another option to throw in with Regents laps, especially now that Loop Road is kiboshed.
For FTP tests I head out to Thamesmead and use this segment https://www.strava.com/segments/9228148
I think @DarrenFranks has talked about a loop around there he uses for ftp tests but i may be wrong.