A 50-meter zip wire, natural climbing structures and sand.
The two-bedroom family suite gives kids their own room with bunks and a chalkboard.
A big sandpit, a basket swing, a roundabout and logs and ropes to climb, so it works from toddlers right up to about twelve.
A nautical ship to climb, a double slide and talking tubes, all fenced, and it suits toddlers up to about 11.
Big sandpits to dig in and a newer Junior Play Zone for the youngest.
Timber beams and rope webs to climb, little nature games tucked around, and a basket swing.
Palace garden play area with towers, a dragon, a grotto, sand and a splash pad, for kids under 12 and included with palace admission.
South Bank hotel with sofa-bed studios for 2 adults and 2 kids, some with a kitchenette, and a heated indoor pool.
Piccadilly hotel with 50 square meter Residences: a separate bedroom and living room, a kitchenette, a washing machine and a Children's Concierge.
Marylebone hotel with 52 square meter rooms with two large doubles, a heated indoor pool and a crib for under-twos.
A big pirate galleon to board, a treehouse and plenty of sand.
A giant sandpit, a timber treehouse to climb, ropes and swings.
The zip wire is the draw, with swings and slides for kids still working up to it, and accessible equipment too.
Aldwych hotel with an 18m indoor pool cleaned with minerals, baby bath, bottle warmer and sterilizer, and cribs and extra beds.
Paddington-themed toddler swings, a play train and small row-house slides, with a separate climbing area for older kids.
Kids' swim sessions in the heated indoor pool and cupcake decorating at afternoon tea.
Kids build their own pizza and soft-serve sundae, and the tables look out over the water.
Swings, a seesaw and a sandpit, a few steps from the lake.
Hotel with a heated outdoor rooftop pool and an indoor pool, and one-bedroom suites that can add a second room, connecting or close by.
A ship to climb, a slide through a shark's jaws and sea-themed sensory play for the youngest.
Timber trails, a zip line and a mud kitchen tucked between the wildlife-watching spots, so kids burn off energy between the quiet bits.
A one-bedroom apartment with a sofa bed and a full kitchen, so four fit and you can cook dinner in.
Bombay cafe in Covent Garden with an all-day kids' menu of smaller dishes with very little spice.
Bamboo to weave through and worm-hole tubes to slide down, all near a giant oak with a canopy walk.
Nine Elms riverside hotel with a 20 by 8 meter indoor pool and suites.
Coffee on a lakeside terrace, with the pirate-ship playground just across the path.
Free museum with a water, light and building play area for ages 3 to 5 and Wonderlab experiments for ages 7 to 14.
The science family suite gives kids their own bedroom with rocket bunks, and there's table tennis in the games room.
Treehouses, rope bridges, zip wires, sand pits and rock pools, with a café next door.
Liverpool Street aparthotel with one-bedroom apartments for four, a full kitchen, a laundry room, and a travel crib and highchair.
Art-deco brasserie with French comfort dishes and a kids' menu of a main plus a dessert.
Pizza, pastries and hot chocolate right beside an adventure playground with rope bridges, treehouses and sand.
Free museum with dinosaur, mammal and volcano galleries, plus baby change, feeding spaces and lifts.
A roaring T. rex, then Triceratops and Iguanodon fossils up close.
A Moomin brunch with a play corner of books, toys and activities, and pancakes on the menu. A ten-year-old still found plenty to do.
Patterns on touchscreens, robot trails to follow and water ripples your kid can play with and stay dry.
Kensington hotel with Deluxe Studios for four that can connect to another room, and scooters lent by the concierge for Kensington Gardens.
Strollers and baby gear to borrow, kid-size bathrobes and an activity passport, and rooms that connect.
A hands-on gallery for kids up to 6, with water for floating and sinking, a construction area, and light, shadows and sound to play with.
Southwark hotel with Double Up rooms joining a king or twins to a queen, two bathrooms, up to 5 guests, and baby bath and bottle warmers.
Foam bricks to build with, stories to invent, and a mini museum just for under-threes.
Soft play shaped like aircraft to climb and slide through, with a separate corner for toddlers.
Sandwiches, cake and ice cream inside a fenced park grown-ups can only enter with a kid, next to the sandpits and climbing frames.
A playzone of little trains, boats and a cable car your kid gets to drive, made for under-fives.
Family rooms with pull-out beds, and the river walk starts at the door with the London Eye just along it.
Build-your-own pancake stacks with sweet or savory toppings, in a restaurant with highchairs at Battersea Power Station.
Race down giant friction slides, watch lightning experiments, then get hands-on with everything else.
Fresh pasta in a small Covent Garden room with no highchairs, suited to kids old enough for an ordinary chair.
Two floors of make-believe story worlds to crawl through, then an outdoor garden to spill into when they need air.
British steakhouse in Spitalfields serving steak, chips and a Sunday roast.
Fresh pasta in Soho, with a kids' menu of half-size radiatori and soft-serve options.
Kids sort pretend mail, run their own post office and take the slide down. Made for the age that loves playing grown-up jobs.
A proper play room, and rice balls toddlers actually eat, looking out over the canal basin.
Free museum and gardens with an animal walk of alpacas and goats, a big walrus, a gallery of musical instruments, a butterfly house and an aquarium.
Free maritime museum with AHOY, a play gallery for kids up to seven, and a giant map of the world to walk across.
A creative play pavilion with sessions for babies, toddlers and kids up to eight, including storytelling for under-fives and sessions for adults with new babies.
An indoor amusement park with rides, games and mezzanine soft play areas for toddlers, plus a pizza and ice cream restaurant on site.
Old tea clipper where kids take the wheel, spin on a compass roundabout and climb through a Kraken play area.
Indoor soft play sized for children from toddlers up to about four feet tall, run out of a community center.
A smaller, long-established indoor soft play inside a shopping center, for toddlers and kids up to ten.
A large indoor soft play space with plenty of room to climb, slide and run around, and it hosts birthday parties too.
Soft play in a community hub with three levels, two slides, crawl tunnels and hidey holes, plus a junior section for young climbers.
A giant inflatable arena with an under-4s area and Inflata Tots preschool sessions where toddlers and grown-ups bounce together.
Soft play and adventure park with slides, climbing walls, go-karts, mini golf and UV-lit tunnels, plus a Toddler Village for under-fives.
Adventure soft play with a homemade-food cafe and an outside space, a long-running spot for toddlers and preschoolers to climb and run around.
South Bank observation wheel with slow enclosed pods for spotting landmarks over the river.
A big indoor soft play for toddlers to climb and slide, with a cafe for the grown-ups.
A pretend town for young kids, with role-play spaces set up as a cafe, supermarket, vet, medical center and construction site.
Historic observatory where kids stand with one foot on each side of the Prime Meridian, with the city's only planetarium next door.
An indoor sandpit and a slide for toddlers, and you get a coffee while they dig.
Historic fortress with the Crown Jewels, armor and tower stories, best for kids around 8 and up.
Soft play inside a leisure center for kids up to ten, with a separate area just for the under-fives.