Chinook just flew from Northolt to Regents Park. Special visitor?
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Preparation for Joe Boden visiting in a few days, I guess.
https://en.m.wikipedia.org/wiki/List_of_presidential_trips_made_by_Joe_Biden_(2023)
And now two Sikorsky's with Marine One colouring, as far as I can tell (not showing up on ADS-B but escorted by the MPS chopper.