Everyone knows that the Japanese are the kings of karaoke: they invented it, continue to improve sound-quality technology (if not the human voice part) and introduced karaoke boxes — private singing rooms for small groups. And anyone in London can now indulge in this latest twist on the popular Asian pastime, thanks to lastminute.com entrepreneur Martha Lane Fox. Her brainchild is

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nginx/1.14.0 (Ubuntu) the Soho-based Lucky Voice , the British capital's most authentically Japanese karaoke bar featuring nine private rooms that hold up to 12 people. Once you and your fellow croonies have settled onto the semicircular benches in your snug,...