Following Sir Kim Darroch's resignation, should ambassadors be political appointments?

To repair a special relationship which has gone - to put it mildly - a little sour, the new Prime Minister needs to appoint a special kind of ambassador.

Sir Kim, who spent most of his career in Europe, neither warmed to nor understood the Trump administration, and any successor chosen from the ranks of the Foreign Office would likely have the same problem.

Assuming Boris Johnson becomes Prime Minister, he must think outside of the box. And a politician - with serious political nous ...