There’s one thing this G20 will have made plain for a country like Britain, it is that pandering to Trump now comes with greater risks than before. Britain’s government seems to be reaching out to an America that is simply not there any more. Brexit means finding oneself alone, separate from a now reinvigorated European club – a molecule cast around by random colliding forces. If this G20 has had a useful lesson, perhaps that was it: that the world has gone haywire, and the words “take back control” have an empty ring. Let;s hope UK will come to its senses soon before the Brexit damage is irreversible.