It was late on 8 February 1941 when four Americans arrived at Bletchley Park. Black-out curtains made the mansion appear even darker. The journey of the four – known as the Sinkov mission after their leader Abraham Sinkov – had been stormy, dangerous and utterly secret.

Their arrival marked the opening courtship of what would become the longest standing – and occasionally controversial – intelligence alliance in history.

To mark the anniversary of that visit, the two directors of the intelligence agencies which grew out of wartime are meeting at Bletchley. Admiral Mike Rogers from America’s National Security Agency (NSA) and Robert Hannigan, of Britain’s GCHQ, are striding up the same path Sinkov and his team walked.

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Image courtesy of  BBC