But there is a downside, too, admits Christian Arden, who has run Po Na Na from its inception.

ECONOMIST: Nightlife

Po Na Na owns nightclubs, but its bars are more relaxed affairs without the focus on loud music and dancing.

ECONOMIST: Nightlife

It was once the Hammersmith Palais, in West London, until it was bought by a chain of late-night bars with a North African flavour called Po Na Na.

ECONOMIST: Nightlife

The phenomenon has also proved popular in the locality, with one Hammersmith resident saying the weekly queues of uniform-wearing clubgoers outside the Po Na Na "attracted all kinds of attention".

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