The Prime Minister met some of the world's most influential and powerful people, but we will not be told who he spoke to, nor what they discussed.
David Cameron was attending the annual meeting of the secretive Bilderberg club. The group insists on total privacy so members can talk candidly about global issues.
But, as Political Correspondent Carl Dinnen reports, there's growing anger at its lack of openness:
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It is hoped the 7,400-mile journey will become a cost-efficient and time-saving way of transporting trade between China and the UK.
The Prime Minister said Parliament will be given a binding vote on the final deal, but said the result will not stop Britain leaving the EU.
Officials from the train drivers' union Aslef will meet managers from Southern Railway, whilst the RMT will meet separately with Acas.