London (CNN)Britain has lost control of its borders. Immigrants make the economy more prosperous. Public services are overstretched because Europeans are pouring in. Which of these statements are fact or fiction is anybody's guess.
Immigration has proved the most divisive issue in the debate over whether Britain should remain in the European Union, and with just a week until the British public vote in a referendum to decide, no one has a clue what immigration will look like if Britain pulls out.