Sadly, I don't think actual LEGO Doctor Who sets would work out very well. Grand total of highly-recognizable vehicles or settings? One, the TARDIS.

LEGO Star Wars works because its an universe in which stories are told. Doctor Who is stories told within an universe.

Same for Lord of the Rings, or Spider-Man, or Avatar: The Last Airbender, or Iron Man. Great stories, but would be a terrible license for LEGO to pick up (Spider-Man and Avatar are actually decent examples of this)