One country that would be smaller than England are the Maldives, since they are a serious of islands that are only roughly 300 square kilometers in area.
On Pluto, where the winter lasts for half of the nearly 250-year orbital period, temperatures undoubtedly do drop to such low values. On the Earth and other planets with an atmosphere, so-called greenhouse gases can trap part of the heat radiated by the surface, keeping the surface warmer.