On an unusually chilly August evening, the party is in full swing at a Bavarian beer garden in Dachau, southern Germany. Waiters in lederhosen and waitresses in low-cut dirndl dresses weave between hundreds of long wooden tables, shouldering 3ft long trays of pretzels, meat and steins of beer. An oompah band swaggers through a rendition of “I’m too sexy (for my lederhosen)”.