A list of Donald Trump's favourite things would be very unlikely to include raindrops on roses and whiskers on kittens (as Julie Andrews famously sang in The Sound of Music).

Instead, the president's list would surely have on it playing golf, a way to brazenly promote his commercial interests and, thirdly, trade deals that generate billions of dollars for the United States.

No wonder he looks so pleased with himself - his working holiday in Scotland has delivered on all three of these passions.

On what was billed as a "private visit" he got a lot of work done.

He is taking home with him a trade deal with the EU which is not only the largest in history, it is also extremely favourable to the US.