Some 15 per cent of voters asked by ICM to name the most important issue in the campaign chose immigration. It trailed only the economy (32 per cent) and was ahead of the NHS (14 per cent), education (10 per cent), tax and public services (nine per cent), and crime (four per cent). In addition, 37 per cent of voters said immigration was a “big problem” in Britain today, while 38 per cent said it was “quite a big problem”.