Even The Big Bang Theory has joked about the recurrence with which the Doctor finds himself in modern London. Jack Harkness felt that was the best place to wait for him, and it's where most of his companions are from. But if you look at the Smith years, only a handful of episodes visit London. And how many of those would you call "London episodes", in the same category as 'Doomsday', 'World War III' or 'The Poison Sky'? 'The Bells of Saint John' probably, but 'The Big Bang' would stretch the point. It was a staple of Russell T Davies's era, but it's just not true of the show anymore; it's a show that we continually praise for its evolution, so surely the cliches should evolve too? Likewise, it's not a textbook Doctor Who trait to feature the companions' families so prominently, contrary to what many Who fans argue against Moffat. Russell T Davies actually brought in that element himself.