The Falklands issue
"There is nothing to discuss."
That - we're told - will be Gordon Brown's answer if and when Argentina's president raises the sovereignty of the Falkland Islands when the two meet later today.
It will be the first meeting between the leaders of the UK and Argentina for more than five years.
President Kirchner is due in London next week to attend the G20 summit, which coincides with the 27th anniversary of the invasion of the Falklands ordered by General Galtieri.
Though now a democracy, Argentina still claims sovereignty over the Falklands whilst Britain insists that the future of the islands is a matter for its residents alone.
The prime minister and the president have agreed to meet today - at a less sensitive time - in Chile - a less sensitive location - in the margins of a conference of centre-left leaders.
Whilst there is a stand-off on sovereignty, both sides are hoping to make progress on restoring flights between the Falklands and the mainland, allowing islanders to trade more easily and relatives to visit the graves of those Argentine soldiers who died in the war.