However, since new visa restrictions came in last year — including a cap on numbers and minimum income criteria — there has been a nine per cent fall, with a 25 per cent drop expected next year. The Mayor urged Home Secretary Theresa May, expected in Delhi later this week, to remove students from the Government’s net migration target. “It is imperative that we shift the debate from numerical targets and squarely on to policy based on promoting jobs and growth,” he wrote in a letter.