When I came to watch Alfonso Cuarón's dystopian film Children of Men, the UK depicted seemed quite up par to what I've heard. That UK had outlawed immigration. Looking at the present day land, if not for influx of migrants, the Kingdom would become a Kill-dome with how fast the population is aging. No need for a world-wide infertility disease.
2027 is around the corner and thank God babies are still being born. That is not the case in the 2006 Alfonso Cuarón film Children of Men. Children of Men is bleak and depressing. It is without hope. Without hope, that was lost, long time ago, because children are not being born anymore. The world has gone to shit. The world has gone to shit because there are no children. There are no Children of Men.