Blink, and you'll miss the coolest places to go in London. The latest obsession among trendsetting Brits is the guerrilla destination, or the pop-up: a temporary restaurant or gallery that gathers buzz, then disappears.
The Reindeer, which was open for just 23 days and nights in the run-up to Christmas, was booked solid before it even existed. More than 11,000 lunch and dinner slots in a candlelit winter wonderland, complete with snow-dusted pine trees, were filled by Nov. 1, thanks to an October spot on YouTube, a viral e-mail campaign and word of mouth. It helped that the Reindeer's creators, Pablo...