1. The Bulgari Spa at Bulgari Hotel, Knightsbridge
Best for: When money is no object
Located in one of London's most exclusive hotels, The Bulgari Spa stays true to its luxurious name. With interior design hewn from onyx and Italian glass, this serene two-storey spa promises "the most advanced beauty, grooming and health-enhancing treatments available today" - but this level of opulence comes at a hefty price.
Treatments are five-star, and include entry to all areas of the spa - which is just as well, given that a 60-minute massage costs from £130. If you're looking for all-out sublime luxury, this is the place for you.
How much? The cheapest treatment we could find was a 30-minute foot massage for £70. The most expensive? A 24 carat gold facial, which costs £450 for 70 minutes. More information
2. Agua Spa at Sanderson Hotel, Fitzrovia
Best for: When you're feeling frazzled
Draped in white curtains, with meditation beds and minimal furniture, Agua is as much of a mental retreat as a physical one - perfect if you're craving calm. The treatment list is long and varied, with traditional rituals and a few holistic favourites such as reiki, Indian head massage and reflexology.
The Pyjama Package is designed to soothe troubled sleepers, with a calming organic facial and relaxing bespoke massage - plus strawberries and Champagne tucked away in the cosy 'slumber pods'.
How much? 80-minute Pyjama Package from £130. More information
3. The Dorchester Spa, Mayfair
Best for: Old-school glamour
The Dorchester Spa is positively dripping with 1930s Art Deco glamour - with a chandelier made of 72,000 real pacific pearls, nine treatment rooms, a manicure and pedicure salon, and midnight blue relaxation room.
Treatments are focused on nourishment, with wraps, facials, and massages inspired by techniques and rituals from all over the world. If you're in the mood to indulge, the Spatisserie serves light meals and afternoon tea - with food and spa packages available if you want to make a day of it.
How much? 60-minute Dorchester Swedish massage from £120; £170 for 90 minutes. Four-hour packages - including treatments, lunch and use of spa facilities - from £362 per person. More information
4. The Lanesborough Club & Spa, Hyde Park Corner
Best for: Fitness fans
This new members' health spa calls itself a 'luxury club for life' - an exclusive cocoon for the rich and famous - and those who can spare £150 for a day pass. Inside you'll find La Prairie spa treatments, Bodyism personal trainers, and bespoke beauty treatments by much-loved British spa brand ila.
The interior design is equally luxurious, with silk wallpaper, wood panelling, and a private gold changing room. Relax in a hydrotherapy pool, unwind with a mint-infused rain shower, then kick back in the spa lounge with butlers on hand.
How much? Book to 'stay and spa' for full access to the health club, 24-hour butler service throughout your stay, 60-minute treatment, and breakfast. £640 per night, for two guests. More information
5. St Pancras Spa at St Pancras Renaissance Hotel, Kings Cross
Best for: Historic luxury
Tucked away in the cellar kitchens of this famous Victorian hotel, St Pancras Spa is inspired by its history, with original brick archways and beautifully-restored tile floors.
Cocooned in this subterranean hideaway, you'll find a treatment menu full of classic rituals: think hot stone and aromatherapy massages, repairing facials and full-body scrubs. These tried-and-tested favourites do the job perfectly.
How much? 60-minute ‘Ultimate Aromatherapy Experience' massage from £105; 90 minutes from £150. More information
Fancy a more far-flung spa retreat? Our Algarve Spa Break - especially designed for Woman & Home readers - offers five days of utter relaxation, with spa treatments, free room upgrade, personal training sessions, and flights and meals for just £1,140 per person. See the details
6. Bamford Haybarn Spa at The Berkeley, Knightsbridge
Best for: Natural remedies
The Berkley is slap-bang in the middle of London - next to Sloane Street and Hyde Park - but its spa feels like it's a hundred miles away. Bamford Haybarn is wholly inspired by the countryside, from the fresh lavender bouquets and organic lotions and potions, to the straw bales in the treatment rooms (yes, really).
The Haybarn's ethos is deep-rooted in natural remedies: rose extract lends its calming and nurturing qualities to massages, while geranium-infused moisturiser soothes after a full-body exfoliation. The Bamford Foot Massage is the ultimate balm for worn-out pins - a treat after travel or life in high heels.
How much? 60-minute deep tissue massage from £135; 90 minutes from £175. More information
7. The Spa at InterContinental London - The O2, Greenwich Peninsula
Best for: Something a little different
On the banks of the Greenwich Peninsula, this characterful hotel spa draws influence from its historic location: exotic silks, mosaic tiles, and sumptuous rugs abound. The result is welcoming and luxurious, and its treatments are equally inviting.
Try the spa's signature Meridian Time Ritual - a restorative experience designed to soothe your body and mind. It begins with a gentle body brushing, a nourishing body wrap, then a heavenly scalp massage. A bespoke facial is the treatment's finale: if you're like us, you'll be sound asleep in no time.
How much? Meridian Time Ritual: £149 per person, 105 minutes. More information
8. The Spa at Mandarin Oriental Hyde Park, Knightsbridge
Best for: Five-star holistic indulgence
Mandarin Oriental is synonymous with sleek Asian opulence - and The Spa doesn't disappoint. Everything inch of this indulgent hideaway is designed to soothe the body and soul, from the amethyst crystal steam rooms to the Zen colour therapy relaxation area. Treatments are lengthy (the shortest is 50 minutes) and holistically-inclined, and there's a separate sanitarium for female and male clients.
The Signature Spa Therapy treatment is just the kind of MOT your body deserves - with a full-body massage (developed in consultation with Chinese medicine experts), and nutrition and exercise guidance.
How much? Signature spa treatments from £240, lasting 1 hr 50 mins. 50-minute Aromatherapy Facial from £125. More information
9. Espa Life at the Corinthia
Best for: Mindful luxury
"Corinthia London is quite simply the Next Generation of Spa," purrs the website of this five-star haven. It's a bold claim, but we're won over by Espa Life's blend of traditional treatments, holistic ethos, and forays into Mindfulness in its spa and fitness offerings. Restless sleepers should try the Mindful Sleep package, to encourage peaceful slumber.
As you would expect from the Corinthia, this is a beautifully-designed retreat with state-of-the-art sauna, steam room, ice fountain and vitality pool - to name but a few. Many of its packages are seasonal - for example Spring Essentials, which features a full-body scrub, massage, facial and manicure.
How much? Spring Essentials package £380 - including lunch, 3 hr 25 mins of treatments, and a glass of Champagne.
All images provided by the hotels mentioned.