You'll enjoy a fascinating and social evening over champagne, drinks and optional dinner with your fellow Revellers and Nigel West, aka Rupert Allason. He's a world-renowned secret intelligence historian and writer.

Nigel will be talking about Operation Garbo.

Juan Pujol García - codenamed “Garbo” by British intelligence - became one of the most successful double agents of the Second World War. Working with MI5, he persuaded the Germans that he controlled a network of 24 agents across Britain supplying highly valuable intelligence.

None of the agents existed.

In 1944, Hitler kept large parts of the German army away from Normandy, because he believed the real Allied invasion was still to come.

Garbo was a Spaniard running an entirely imaginary spy network from London.

Yet senior German intelligence officers trusted him so completely that even after Allied troops had landed in Normandy, they continued waiting for a second invasion in the Pas de Calais.

Why did they believe him and how did the deception work?

How could one man, with no formal intelligence training, manage to manipulate the Nazi regime so effectively?

And how did he disappear completely after the war?

Garbo’s cover was never broken.

He remains the only person ever awarded both an MBE from Britain and the Iron Cross from Germany.

After the war, the world believed he had died in Angola.

In reality, he had fled to Venezuela, where he became a langauge teacher working for Shell Oil.

Years later, Nigel West tracked him down.