And psychological.
Population numbers aside, people know the name "London". Seeing a big alien ship there, along with other major cities, only adds to the feeling of claustrophobia.
Prime or not, these ships were designed to be mobile and to store great quantities of food. Compared to outer space, a ship over London that would be redirected to, say, Hong Kong, would be a walk from the fridge to the stove to them.
A missed opportunity might have been an episode of another ship still in transit from the home planet and discussing the wait time involved to get to Earth, then finding means to get the audience to hate the aggressors even more...
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