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12th Knot

Bars and pubs, Hotel bars South Bank
4 out of 5 stars
4 out of 5 stars
(33user reviews)
12th Knot

Time Out says

4 out of 5 stars

Showy sky-high bar at the South Bank’s Sea Containers.

Please note: since this review was published, Rumpus Room has been renamed to 12th Knot and Mondrian London has been renamed to Sea Containers. Time Out editors, 2019.

Hotel bars used to be the straight-laced kind of place you’d take your ’rents. Not so at Sea Containers, where Dandelyan has been winning awards on the ground floor while level 12’s Rumpus Room has stayed a bit of an inside secret. Now this chic bar is ready to welcome the world, with a terrace overlooking St Paul’s and DJs to lure sophisticated after-workers and Friday night socialites.

I say socialites, since the venue claims to take its cue from the Bright Young Things, a group of hedonists followed by the tabloids in the 1920s. Think England’s non-fiction ‘Great Gatsby’ (or the ’20s version of the sidebar of shame). In truth, the theme’s not obvious, but the setting is pure style.

Waitresses work the room in floaty, floral numbers you’d expect to see on Kate Moss in the French Riviera. And she’d probably approve of their way (a million miles from ‘basic bitch’ service). There are mauve banquettes, glittering chandeliers, and a shiny gold bar, but it’s the view that really wins the crowd. Stick around for sunset, when the room gets more blingy.

Don’t expect such an atmosphere without paying a pretty penny; solid classic cocktails cost £14. My paloma was faultless, but my bank card withered when I promptly reached the bottom of the glass. Stick with champagne cocktails to feel more at peace; after all, Rumpus Room is an occasion bar. We can’t vouch for ’20s-style hedonism, but you’ll see some modern-day bright young things trying their damnedest.

12th Knot says
As the warm weather and longer evenings roll in, we're excited to welcome you to 12th Knot, our rooftop terrace bar and lounge. Plush seating, seasonal and ingredient led cocktails and food, DJs and live music - all set against an unrivalled backdrop of the River Thames and London.

A true reflection of South Bank's vibrant energy, expect bright, verdant décor and an open-plan layout which puts the panoramic views centre stage. So whether you're curled up on a window seat, relaxing on the balcony, mingling at the bar or on the dance floor, London's breath-taking skyline is the main attraction.

Offering a wide selection of champagnes, wine and spirits as well as a brand new cocktail menu inspired by the golden age of transatlantic travel.

Enjoy live music every Wednesday at our Skyline Sessions featuring some of London’s hottest bands, as well as DJ’s from Thursday through to Saturday. Grab some friends and join us in our elegant playground that will harness the youth and energy of the South Bank while projecting the glamour of modern London.

The space is the ideal London venue for receptions and parties for up to 300 guests, with the outside terrace providing a perfect opportunity to watch the sunset, drink in hand.

Dress code: smart/casual - no sportswear, trainers or flip-flops


Address: 20 Upper Ground
Transport: Tube: Blackfriars
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Users say (33)

4 out of 5 stars

Average User Rating

3.9 / 5

Rating Breakdown

  • 5 star:11
  • 4 star:12
  • 3 star:7
  • 2 star:2
  • 1 star:1
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1 of 1 found helpful

Hidden with its own private lift there's no way you would stumble across it but the Rumpus Rooms really is a gem along Southbank. From its dramatic views of St Pauls to the delicious selection of cocktails, there is nothing you could want more from a rooftop bar in Central London. I was pleasantly surprised by the band on the Wednesday I visited, but they certainly push for only the best and the live performance was a welcomed addition to my visit. I can't wait to come again and try even more of the extensive range of cocktails available. 

1 of 1 found helpful

Tucked away in a hotel, on one of the top floors is this sky bar, overlooking the river and London’s stunning skyline. Drinks are a little on the pricey side but you get what you pay for with impeccable table service, beautiful interior and, if going on a Wednesday, a wonderful quartet singing everything from Shaggy to Adele-great fun! Fantastic date night venue if you want to wow!

1 of 1 found helpful

Fabulous views that make you say 'wow'. Service on the way up was lovely, but unfortunately I left feeling a little mugged off. 

After waiting for table service for some time, we decided to go to the bar to order ourselves. A £50 bottle of bubbly (the cheapest on the menu) was just opened and placed in front of us with no wine-bucket or glasses, and they then tried to charge us 12% service charge. For what!? You've done nothing! So after a drawn out process of 'can we get a bucket.... and now can we get glasses....' I had the service charge removed, which drew a sneer from the bartender. 

Entertainment was great though, which together with the knockout views made up for the lack of service. 


Top tip, book in advance. It only opens at 5pm and is closed on Sunday and Monday. Even at 5pm it is busy, you struggle to walk even if early!

Totally worth it, cosy and glamorous in the colder months and a fabulous terrace in the summer. 


A lovely, spacious bar to have a drink and nibbles! My friend and I came on a weeknight and it was buzzing but not as much as I imagine it could be on a weekend. We opted for seats by the bar and were served by a super friendly Australian bartender. He helped my friend pick a cocktail based on her preferences and kept us laughing throughout the night! The bar itself also has balcony for the warmer nights but by the time we arrived, it was a little chilly. I also imagine the bar looks even nicer during the day with natural light shinning through the large windows. I went for the East India Elixir, which was lovely but a little too sweet for my liking. It went down smoothly and was rather refreshing! 


We went here on a saturday afternoon this summer and really enjoyed having a few drinks in the sun. As mentioned below, it definitely is on the pricey side but the views are so beautiful and the atmosphere is great too!  Lovely decor inside too and the service was really fast! I do suggest booking if you want a table guaranteed or if its a special occasion, otherwise the wait was only about half an hour or so. Enjoy! :)


I went here on a Wednesday for a few drinks and I was really impressed by the vibe of the room with the wonderful views over St Paul's and the live music with changing bands every week. The weather was great so people were enjoying their drinks outside on the terrace. We also had a few bar bites and they were quite tasty. I would definitely come back!

Great view and nice atmosphere. Drinks are super expensive, but really good. The staff does not give the impression that they like to work there or want to give guest a experience. You don't really se them smiling. Been given a table even without a reservation. Friendly host!


For amazing views across London, this place is up there with the best. A beautiful space with both an indoor and outdoor area located on the South Bank, the atmosphere is fantastic and the cocktails are delicious. Specialising in the champagne variety, a huge cocktail list is on offer, although you can obviously still order your favourite beer or wine if you prefer.

The bar snacks are delicious too and there is often live music playing. Come for the spectacular views of St Pauls and stay for the evening!

Beautiful venue, complemented by a lovely view of the Thames and St Paul's cathedral. Even though it was on a Friday night and relatively busy, me and my friend managed to get a table. The terrace is simply great for the warm summer evenings to come (hopefully!)


Stunning interiors with equally stunning views. Who doesn't want to sip on champers with a backdrop of the Thames and St Paul's. Attentive staff and overall a really enjoyable evening that should be saved for special occasions.


I recently went to the relaunch of the Rumpus Room with Champagne, cocktails, canapes (though I only saw one) and a live band. This place has one of the best views of London from South bank and is an ideal spot for drinks with friends or a romantic date, especially with the longer spring evenings! The lounge has a very relaxed atmosphere with beautiful dandelion lights and there is live music every Wednesday. No Prosecco available, only Champagne, but the drinks prices were average for London, but not extortionate. I will definitely be back, the view is dreamy! 


We ended up Here.. Or more like I ended up here after taking an evening stroll around the south bank .... It was meant to be a quick drink to revive myself from the dehydration all that walking brought on ...... ;)

Anyhoo there was a pleasant enough selection of drinks available. From crisp chardonnays to deep merlots and cocktails. The service was pleasant and the decor warm and sensual. I enjoyed myself enough to want to pop in again on another night. I think its a nice place to bring a date in fact! Yup winner


The beautifully decorated Rumpus Bar offers great views over the city and is very much a hotspot in this part of town. It is one of those bars that just seems to be crowded all the time. Definitely not want to go to if you've scheduled a long overdue catch up with someone as you might not hear a thing of what the other person is saying. Moreover, the place is a little pretentious and so is its staff so keep that in mind if you do decide to spend your night here.


Had a lovely evening here with my other half!  We ordered cocktails and oysters - very lush!  Service was good, and there was a lovely atmosphere with live music.

The crowd is a mixture of media types, city workers and tourists all enjoying the wonderful views of our fab capital.

It is pricey, however for a treat it's well worth it!

If you looking to impress without the aura of trying too hard, I would recommend the Rumpus Room at the Mondrian Hotel, South Bank. It’s on the 12th floor of the hotel, has open air balconies and 360 degree views of London. It’s not cheap, but I would recommend getting a bottle of red, charcuterie board to share and go on a Wednesday night for some free jazz whilst you sit and take in the views.


The view is amazing from this bar, and the location is great. Wish I could say the same about the staff! I have never felt so uncomfortable in a place in my life. Dressed the way I usually to (skinny jeans and a nice top), it was clear that the staff do not have time for people who don't look like they have money to spend. I'm surprised that to this day people can still show prejudice against those who look different and express themselves outwardly with tattoos/piercings etc. 

Literally stayed for one drink (which I basically downed) and left straight afterwards. Will never return. Such a shame too, as the atmosphere and views are stunning!

The view was incredible and the drinks were pretty good. The design is chic and simple which contributes to an amazing atmosphere with great music from the DJ. We had an amazing night and stayed until closing. However, the staff is not very welcoming and the service is quite slow. I would recommend trying to reserve a table if you want to avoid standing for most of the night as it is very busy. 

Staff WriterStaff Comp

Rumpus rooms, a complete Wow bar. Amazing view over the London skyline, fabulous cocktails and really chic decor. Ideal for a special night out or for visitors to the city for cocktails and a wonderful view.


I absolutely adore Rumpus Room and I rate it as one of the best bars in the city with one of the prettiest decors to boot. Note that it's fairly often used for private events so ring ahead and check. The staff at the mondrian are second to none, the bartenders are friendly and everybody has customer service as top of their agenda. They'll make you feel super welcome, and help you figure out what drink you should have too (note - these guys know their drinks). 

Beautiful view, great staff, lovely vibe. Recommended.

Staff Writer

What a venue, what an incredible space and almost a luxury to be able to drink such great cocktails with the view it has over The Thames to St Paul's etc. Worth the visit. 

The view from this bar is outstanding. Sat at the top of the Mondrian Sea Containers hotel the Rumpus Rooms has a great atmosphere and a fantastic range of drinks. The view is to die for with St.Paul's right in front of you. Highly recommended for somewhere to meet and drink if you want to impress. 

This is so not obvious!  It's one the 12th floor and its terrace is partially enclosed so you can't tell it's even there.  Having been here for a private event, I am not even sure if this place is normally just a bar or whether you need booking.  But the view is impressive, it's well lit, it's not too noisy and staff are friendly.  I liked the G&T but I wasn't too keen on the other two cocktails and I didn't get to try any of the canapes - but I like how it feels down to earth even though it's actually a really lush space - would be great for other hired events.  The layout also means you can see everything and cannot get to crowded.  I love that.

 I love this place.

Firstly, WHAT A VIEW! One of the best views of London without a doubt.

Secondly, some amazing drinks. I had the All British Whiskey Sour which was just fab.

Finally, the service was friendly and attentive and I will definitely be returning soon.

Staff Writer

So my evening at the Mondrian Hotel started on ground flour at the Dandelyan Bar, which offers a cosy atmosphere by the river and classic cocktails. Then our group decided to move to the rooftop bar, the Rumpus Room. The views over London (especially St Paul are beautiful) and the bar's decoration rather minimalist but very stylish. It was friday night so there was a DJ playing rather cool music. The disappointment is the staff which is not as friendly and professional as the staff from the Dandelyan bar (you wonder why as you are in the same hotel....) but the list of cocktails makes it up for it! delicious and original cocktails. Booking is highly recommended over the week-end.


I've given this place two chances... I thought it was only fair...

First time - I was incredibly shocked at the cost mainly because I ended up having to go to the bar myself to order (despite the place being quiet) then make two trips back to get everything to the table... The guy charged me £4 service charge... I almost choked! We stayed for one cocktail after that, then moved on to something a little less pricey...! 

Second time - I asked if we could use Amex... Suddenly we were assigned a waitress and they were tripping over themselves to serve us!

The coctails are great and the view is pretty incredible but the customer service leaves a lot to be desired. I don't think I'd recommend this place although I imagine it would do pretty well due to it's location...

Yet another rooftop bar in London so decided to go check it out past weekend. All staff is friendly, but comes across rather fake. Positive points are the cocktails, the view (obviously) and the music. The tunes played by the lovely DJ (curly blond hair, "geek style" spectacles and a "boss like" attitude) would have been the perfect jam to dance on all night long. Unfortunately not a single person (apart from the staff) was dancing and I am quite sure that people would have stared you out of the bar if you actually did.

It seems like Rumpus Room still has a few things to learn, but compared to the other roof top joints in town, it is definitely not the worst one. Go and check it out.

Went there last Friday with a group of friends hoping to celebrate my birthday. The worst experience ever, those guys have no idea about customer service. Massive disappointment! 

0 of 1 found helpful

If you enjoy people watching like I do, this is the bar to get into. On the rooftop of the stylish Sea Containers hotel, the Rumpus Room has a beautiful view of St Paul's Cathedral from the balcony. However, the snobbery of the staff and punters alike is a bit off-putting. When you get to the entrance without a booking, the staff really make no effort to make you feel welcomed. The decor inside is plush and the crowd is definitely young and there to be seen. It's a great laugh if you don't take things to heart easily.

0 of 1 found helpful

This sky bar definitely has the wow factor when you first arrive. It’s full on plush and has a view to die for but when we arrived on a Saturday at 6pm it was so rammed that you could barely get to that amazing view.

Everything looks perfect at this venue, with overly priced but amazing cocktails, model looking waitresses in stunning uniforms and designer style furnishings but after the initial wow factor subsides you’re left with a gorgeous view that you can’t properly see through the crowds and a fairly hefty drinks bill.

Overall this place looks good but it’s kind of lacking in substance. There are way better sky bar options out there.