The music follows on the success J-pop in the 1990s, which found a strong following in Asia but never crossed the Pacific, unable to break through the Western music market.

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Am sang "I Gotta Feeling" with octave-hopping pop singer Jessie J, X-Factor alumni JLS produced a medley of hits, while Barlow performed a duet with a painfully out of tune Cheryl Cole.

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The latter has set up pop-up Sephora stores inside J.

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"It shows the broad spread of British pop music, " said Alt-J's Gus Unger-Hamilton of the diverse shortlist.

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The Boutique plays host to pop-ups from luxury shops and brands including Browns and J Brand and is small enough to feel like a personal shopping service.

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