Goldman Sachs chief executive Lloyd Blankfein has taken to social media for the second time in as many weeks with a veiled swipe at the UK's impending exit from the European Union.

In a tweet sent on Monday afternoon, punctuated with the hashtag Brexit, the head of the US bank wrote: "In London. GS still investing in our big new Euro headquarters here. Expecting/hoping to fill it up, but so much outside our control."