“A subsidiary issue, but related, is what the position would be if Anna was not entitled to live in the United Kingdom but required to return to Poland. Would she then be able to receive Gilenya? This is not a matter on which there was evidence before the District Judge. It may be that Gilenya is available but only on a private basis in Poland. It may be that there would then be an issue as to whether she would be able to afford it or whether, in practical terms, it would not be available then to her.”