Via the Telegraph:
Mr Miliband spoke to the Russian foreign minister - a veteran not known for diplomatic niceties - to express British unease at events in Georgia. It seems Mr Lavrov didn't like being lectured by young Miliband.
Such was the repeated use of the "F word" according to one insider who has seen the transcript, it was difficult to draft a readable note of the conversation.
One unconfirmed report suggested that Mr Lavrov said: "Who are you to f------ lecture me?"