You really don't seem to understand.
You will get the low res textures directly over London if you're far enough away.
It's the distance from the point of view that matters, not the location. The grafics engine draws a "square" around your viepoint.
Within that square all ground textures are high res. At a larger distance they become medium res, and even further out they become low-res. I really don't know how to better explain it.
My problem is that the texture colours between medium LoD and low LoD are quite different, resulting in the ugly "square" effect.
