Is London City a busy airport?
It's a peculiar airport in general because it's right in the middle of the old docklands on a bit of reclaimed land and only relatively small jets can land there. Unlike the other London airports which are all miles outside central London and serve all sizes of planes.
Fun fact - it's the only major airport in the world that doesn't have a control tower on site (to save space). It is remote controlled from 80 miles away.