IT'S TEA TIME ON THE SOUTHERN COAST of England, on a rainy summer afternoon, and I'm sipping Tetley's from a flowery cup, huddled, along with six others, in the vestibule of a palatial tent. An impressive spread of sushi, lemon-and-coriander hummus, grapes, and four kinds of cheese is arranged before us. Nina Simone is crooning about lost love on the portable CD player, and we've swallowed enough red wine that we don't care when someone knocks over a glass of champagne while trying to grab the last California roll. Nor are we worried that our two giant red-and-white polka-dot cushions are now officially damp.

This is "glamping," a British fad that awkwardly marries King's Road glamour with old-fashioned car camping. Over the past couple of years, glamping has become the new fag-and-a-pint for the UK's cool kids. The same young urbanites who only recently favored boutique-hotel weekends in European capitals are instead choosing to spend a debauched night or two under the stars—or clouds—at KOA-like drive-in sites and British farms.

And there are lots of them. In 2005, the year the term glamping first appeared in the British press, 16-to-34-year-olds accounted for 43 percent of the 4.4 million camping trips taken in the UK. The Camping and Caravanning Club, which registers some 3,500 camping sites across Great Britain, added 50,000 new members in 2006, boosting their total to 420,000. Already this spring, the club has counted a record number of overnighters, some of whom are enjoying posh new amenities like heated sleeping pads and Wi-Fi. (Meanwhile, "glamping" has caught on as a label for luxury camping in the U.S. and other countries.)

Comfort and style are central to a glamper's idea of a good time, and marketers have taken note. This summer, Cath Kidston—an artsy British clothing-and-housewares retailer—is again adding to its line of camping gear. Last year's rollout featured a tent printed with cowboys riding horses and twirling lassos; this season's hot items are sleeping bags and air mattresses in metallic silver, with decorative stars. Meanwhile, Millets, the UK's take on REI, is selling a new Oriental Design rain fly—patterned with what look like soft-hued lilies—and a botanical-print geodesic dome. The goal? To help you "stand out in a sea of tents."

Here at the Warren—an 80-site private campground nestled between the seaside villages of Folkestone and Dover, about two hours by car from London—our glamping crew definitely outshines the 200 or so family campers braving the deluge. Adorning our zippered doorway is a garland of faux orchids, and just a few feet away, anchored in the mud, a sparkly plastic windmill is spinning madly.

Our group of twenty- and thirty-somethings consists of Miranda and Karen, two Londoners woefully underdressed for the weather in designer jeans and delicate layers; Hannah, a product designer who has thoughtfully packed an extra pair of everything; Annie and Mark, an attractive couple who work in media; and our den mother, Imogen.

A clued-in type who has a nice job in television and "loves the city," Imogen is the most experienced glamper among us, having spent more than a dozen nights in a tent in 2006. Today she's wearing a fitted denim jacket, a flowy red-and-white skirt, and pink Wellington boots. It's thanks to her that I, a virgin glamper, have my bare feet wrapped in a colorful knitted throw.

To Imogen, these extras are precisely what make glamping fabulous. "I remember seeing a flier with a flowery Cath Kidston tent on it," she tells me. "I thought, I have to have that. It's inspired me to bring all the other fun things and decorate."

Of course, paying so much attention to campsite trappings means glampers often forget about their natural setting—which, frankly, seems admissible at many of Britain's underwhelming outdoor destinations. But it's a shame at the Warren, which offers stunning cliffside tent pitches facing the English Channel. They're so close to land's end that, on a clearer day, you could imagine sailing a paper airplane all the way to the Continent.

The campsite managers, mellow retirees from South Wales named Terry and Lyn Hawkins, are big fans of glamping. "We love that not all tents look the same anymore," Terry tells me while making his rounds shortly after we arrive. "Camping has become trendy with people who actually want to socialize—to drink wine under the moonlight until one or two o'clock in the morning. We think that's great."