The government shutdown is having a most troubling effect across the pond in London, where a lavish cocktail party on tap this week for new U.S. Ambassador Matthew Barzun has been postponed .

The party at the tony Connaught hotel, sponsored by Tatler, a Conde Nast publication, promised “many pyramids of Ferrero Rocher” —  a superb chocolate, we’re told — to welcome Barzun to town. The former Obama 2008 campaign finance chair and mega-bundler left his ambassadorship in Sweden to come back to run fundraising for the 2012 campaign, and then assumed his duties in London at the end of August.

“Ambassador and Mrs. Barzun are no longer able to attend on Tuesday, so sadly we are postponing the event,” said Jennifer George of Condé Nast, according to the Evening Standard. “Sorry for any inconvenience. We will let you know when we have a new date.”

An embassy official advised us that Barzun thought attending the Oct. 8 event would not be appropriate in light of the shutdown and had asked that it be postponed. Seems  embassies, during the shutdown, have been asked to reduce activities that were not considered essential, apparently even when no government funds were involved.

This event, being a private — not official — party, fell into that non-essential category. Perhaps when the shutdown is over?  The chocolates surely can keep for a while.