Denmark is regularly ranked as one of the happiest countries in the world - with a cosy international reputation as the home of hygge and Lego, the idealistic fictional prime minister Birgitte Nyborg in Borgen and the woolly jumpers of TV detective Sarah Lund. But that warmth does not extend to asylum seekers - and in recent years the country has developed some of the toughest illegal migration policies in Europe, despite being led for six years by a centre-left politician. PM Mette Frederiksen'