Nothing reminds us of the historic links between England and Australia like an unsuccessful Ashes series. But arrive in Heathrow after a long-haul flight, as I did some months ago, and you quickly discover that those historic links seem more like ancient history. As the citizens of Germany, Italy and Poland are hurried through the priority processing of the European Union, the remainder are shuffled through to a village of the damned labelled “non-EU”. I had arrived, like nearly a quarter of all visitors to the UK, as a student. It appeared, from the size of the gathering queue, that…