Back in 2006 I had an amicable email joust with London on the subject of our Balkans policy, consistency or otherwise thereof.

The point was made by HQ that the FCO would be a depressing place if we did not have lively disagreements or felt that our policy was watertight.

To which I amusingly asked "How tight is a duck’s bottom – and FCO Balkan policy?"

Watertight.