Seoul has quietly become the world's capital for treatments you simply can't get at home — and the writer behind this piece spent half her trip finding out which ones are worth the flight. The short answer: quite a few, and usually at 30 to 50 per cent less than UK, European or US prices.

The city splits neatly by neighbourhood. Gangnam and Apgujeong hold the high-end medical clinics; Seongsu, across the river, is where the trend-led flagships and pop-ups live. Clinics start with detailed skin assessments — hydration, pigmentation, elasticity — so treatments are tailored rather than one-size-fits-all. Rejuran, a salmon-DNA skin booster behind the famous 'glass skin' look, remains a Korean speciality.

The writer's five standouts make a solid starter itinerary. First, a seshin: the full-body scrub at a traditional jjimjilbang bathhouse, which is bracing rather than gentle but leaves skin startlingly smooth. Women-only Spa Lei in Gangnam costs from about £8 entry, with scrubs at £22.50; Paradise City CIMER near Incheon airport spans six floors and includes a virtual spa room with LED scenery. Second, a lymphatic drainage treatment — booked straight off the plane to beat jet-lag puffiness. Art de la Peau in Myeongdong does a 90-minute facial and body combo for around £130, and the post-flight de-puffing apparently works.

Third comes the viral head spa. EcoJardin's flagship offers an 18-step version for £190, beginning with a scalp diagnosis under a digital microscope and working through cupping, custom oils and the much-photographed steam-inflated cap. Haircuts run roughly 40 per cent cheaper than in major UK cities, and digital perms — the secret to K-pop bouncy hair — are an add-on worth considering.

Fourth: personal colour analysis, the Instagram-famous consultation that matches your skin, hair and eye colour to a 'season' of shades. The N Seongsu branch of Olive Young offers them free (arrive early for a same-day slot), or Colorize Store in Myeongdong charges about £80. Knowing your season makes shopping at Olive Young — a beauty mecca in its own right — far more efficient.

Finally, for anyone short on time, a beauty concierge service such as Aneue can build a whole itinerary of vetted clinics, with a translator included. Itineraries start at £1,122 — pricey, but it removes the guesswork from a scene that can feel genuinely overwhelming.

Practicalities: Virgin Atlantic flies direct daily from London Heathrow to Incheon, from £889 return, with a 12-13 hour flight time. The Mondrian Seoul Itaewon is a handy design-led base from £200 a night.

Who is this for? Anyone planning a trip to South Korea who wants more from a visit than temples and barbecue — beauty travellers especially. It's an unusual angle on the city: the treatments double as cultural experiences, from the communal bathhouse to the hyper-personal diagnostics that are still rare in the West. Just book the jet-lag facial before you fly.