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@ChasnotRobert
Ok, so let's just go through how roots vs foundations actually works.
The problem here is that some soils shrink when water is extracted. Notably clay soils which are prevalent in London.
So if you have a large tree in proximity to a Victorian house, the water extraction of the tree can exacerbate the natural seasonal variation in soil moisture deficit, and in extreme cases cause subsidence.
I would not worry in the least about removing the eucalyptus tree in that photo.