Robin Snell takes a look around the rolling fields and hills of Wormsley Park, a luscious green space in the Chilterns that’s home to hares, kites, sheep, deer and partridges. “The site we found was perfect in pretty much every way,” he says. “It has a beautiful outlook. It’s quiet. And we’ve been able to fit the pavilion into the landscape very conveniently.”

Snell, an architect and clarinettist, has reason to be proud. The pavilion in question is an astonishing creation: a 600-seat opera house in the heart of the coutryside. What’s more, after its five-week season, this daunting collection of steel poles, timber planks and PVC screens will be packed away. This is pop-up opera, and when The Magic Flute opens here on Thursday it should confirm this delightful marriage of architecture and landscape as one of the most thrilling places in the country to hear live music.

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