Did a London hotel room become part of Yugoslavia?

On 17 July 1945, the United Kingdom became a little smaller, and Yugoslavia a little bigger.
 On the orders of Winston Churchill, suite 212 of Claridge's Hotel in London became Yugoslav territory, for one day only. This allowed Crown Prince Alexander of Yugoslavia - part of the exiled royal family - to be born on home territory. The front door became an international border. Room service was made in one country, and delivered in another. The story of suite 212 is repeated on the Crown Prince's website, in the official history of Claridge's, and in countless books. Just one problem. There is - it seems - no proof that it's actually true. Continue