The hon. Gentleman will know that when we leave the single market, freedom of movement falls. We said that in our manifesto and we are saying it now.
The available research confirms the salience of migration to leave voters. In June 2017, a report collated from the British social attitudes survey revealed that the most significant factor in the leave vote was anxiety about the number of people coming to the UK. A comprehensive study published by Nuffield College drew similar conclusions.