Cardinal Vincent Nichols says he is dismayed that immigration has become a defining issue of the general election campaign. But are Catholics making a moral choice if they seek to use their vote to limit the numbers coming to live in Britain? Net foreign migration to the UK in the year to September 2014 amounted to more than 353,000 people – that’s the number of foreign nationals arriving in the country, less the number leaving. In three years, you’re talking over a million people. Most of that figure, incidentally, is accounted for by people coming from outside the European Union.Given the sheer scale of that human influx, it’s not unreasonable for the population already here to be perturbed about its impact and worried about the effect on schools, hospitals, hou