"The prime minister called it silky, " it reveals of Baroness Thatcher's enjoyment in 1989 of the Chateau Margaux 1961 - which was subsequently bumped up from an A rating to an A1.

BBC: UK government's tasting notes reveal wine diplomacy

Labour's Tom Watson has previously used a series of parliamentary questions and Freedom of Information requests to discover that the cellar featured high-profile wines from the likes of Chateau Latour, Chateau Lafite, Chateau Margaux and Chateau Mouton Rothschild.

BBC: Government wine cellar escapes cost-cutting axe