Furthermore, in addition to the practical aspects you list, it was actually London City Airport that was evacuated; that's the small, single-runway one in the D

Furthermore, in addition to the practical aspects you list, it was actually London City Airport that was evacuated; that's the small, single-runway one in the Docklands. Because of its steep approach there are only certain specified aircraft types permitted to operate there and anything untoward would be quickly spotted. It's also 11 miles east of the Ecuadorian embassy, requiring a journey right through the heart of the city. Whereas RAF Northolt is a much quicker and easier trip to the north-west... I think we see here how 'false news' starts. Unhelpful facts are omitted or made ambiguous, and then mixed with a spoonful of conjecture.