The case against mass immigration is a moral one. Melanie McDonagh (“Moral boundaries and national borders”, 7 March). stresses, quite properly, the Paul Collier line that, generally speaking, it makes each country of origin that much poorer. It loses its more skilled workforce to countries like our own. But there is a moral case against mass immigration in terms of protecting our own country’s poor. This is particularly urgent if we believe that the New Testament is the Gospel for the poor. The previous Labour Government’s decision to open Britain’s borders to four million new immigrants pushed down the wages of the poor, made it even more difficult for them to get a house at a reasonable rent, or  schools of their own choice for their children, and inc