By Frederick Dixon: Boris Johnson, we hear, has queried whether the rapid increase in our population would cause so much concern if it was due to a high birth rate among White Anglo Saxon Protestants. This, needless to say, is a not-so-subtle hint that those who complain about immigration into our tightly packed little island are not really concerned about our resources and environment but are actually “racists” or even (whisper it quietly) “Nazis” who really want to deport all…