This page - updated throughout the day - brings you highlights and news from event, which celebrates a new F1 era, focused on bringing fans closer to the world’s most exhilarating sport.
It's been emotional
Signing off from F1 Live London after an amazing day in the heart of the capital. Look out for more news, reviews, images and video from the event on Formula1.com over the coming 24 hours.
In the mix
The car runs complete, fans then got to enjoy a headline set from superstar girl group Little Mix. Picture © Getty Images
Anyone for donuts?
Now that's what you call putting on a show! It's hard to tell who loved it more - the drivers or the fans!
Massa's meet and greet
He may be among the most experienced F1 drivers of time, but some experiences never grow old.
Scream if you want to go faster
Jenson Button gives supermodel Naomi Campbell a unique tour of the Trafalgar Square streets.
Kimi Raikkonen and Valtteri Bottas aren't the only Finnish F1 winners in town - and it's not just fans getting a kick from encountering F1 heroes: Force India's Sergio Perez is clearly delighted to be sharing a ride with two-time world champion Mika Hakkinen.
Stoffel hits the streets
McLaren's Stoffel Vandoorne pilots a little piece of history around some equally famous landmarks.
A selection of pictures from the day so far. All images © Steven Tee/LAT/Sutton Images
Just a reminder...
For all those who don't happen to be in London for today's festivities, you can now watch live online.
There are some treats in store in Trafalgar Square - for F1 fans and music lovers alike.
Remember this guy? McLaren drafted him in for Monaco earlier in the year, and now the 2009 world champion has joined us in London.
Up for the challenge?
Another way for you to get involved in F1 - Tata Communications, the Official Connectivity Provider to Formula 1, are in Trafalgar Square today and unveiling the second challenge of the 2017 F1® Connectivity Innovation Prize.
Daniel does David
Red Bull's Mr Ricciardo is really getting into the London spirit with this impression of a certain famous British broadcaster (who probably knows a bit about honeybadgers!)
For children aged 11 to 18, F1 in Schools is a not-for-profit company established in the UK in 2000. Its remit is to give an opportunity for students to learn all about STEM-related subjects, with the aim of helping them into a career in engineering and motor sport.
Mercedes meet the Mayor
The reigning world champions offer Mayor of London Sadiq Khan a drive of their F1 charger.
Excitement is building ahead of this evening's parade run - even for the most seasoned campaigners on the F1 grid.
All change please
Think you're the fastest (wheel) gun in the west? Here's how you try your skills.
An F1 classic
Renault are celebrating 40 years of F1 racing this year, and they have brought along this piece of nostalgia - their very first Formula 1 car.
1994 British Grand Prix winner Damon Hill is in Trafalgar Square - and he's been reunited with the trophy he won that day. No it's not called Nelson - that's the chap on top of the column...
Look and learn
Formula Student is here in Trafalgar Square. Europe's most established educational motorsport competition, its aim is to develop young engineers and encourage more young people to take up a career in engineering.
Feel the buzz
If you happen to be in London today, why not stop by for cars, drivers, music and more...
Our reigning world champion
Looks like it's not only current drivers who are keen to get in on the F1 Live London action.
As well as fans, there will be plenty of special guests here today - and Haas have already hosted one.
These guys will be at the wheel later - don't forget you can watch live coverage of the parade on Formula1.com later this evening.
Susie on stage
Dare To Be Different (D2BD), a UK-based group started by ex-driver Susie Wolff in 2016, is here to give talks to female schoolchildren, helping empower them to follow a career in motorsport. D2BD will offer time with some of motorsports’ leading women such as Williams’ deputy team principal Claire Williams, with the goal of inspiring, connecting and celebrating women in the sport.
Taking over Trafalgar
As you can imagine, preparing for F1 Live London was not the work of a moment!
They're all here
For the first time in Formula 1 history all 10 teams have come together outside of a race weekend to put on a show for the public.
Apples and pears
In preparation to their trip to London, we thought we'd test some of the drivers on their knowledge of cockney rhyming slang - with some amusing results. You won't Adam and Eve it...
The London commute
Felipe Massa en route to F1 Live London with Williams' chief technical officer Paddy Lowe.