Mayor of London launches a next-generation city data platform to unlock the power of data for Londoners

• Mayor of London launches new cutting-edge Data for London Library to make it easier to use data to benefit Londoners and London and power smarter AI-enabled public services
• The Library is a key step in improving data sharing across the city – which is essential to the AI, data and infrastructure London will need to power the next generation of public services – by connecting datasets held by organisations across the capital
• Launched during London Data Week, a 50+ festival delivered by the Greater London Authority,  London Councils and the Alan Turing Institute, this delivers a manifesto commitment to bring forward new data services that support city priorities and ensure the digital and AI revolution serves Londoners and their needs

The Mayor of London, Sadiq Khan, has launched the Data for London Library, a cutting-edge new platform that will transform how London collects, shares and uses data to improve public services, unlock growth and create a more inclusive, sustainable city.

Launched during the biggest ever London Data Week, the Library is part of the Mayor’s ambitious Data for London programme and marks a major milestone in the evolution of London’s data infrastructure. It will replace the London Datastore, which was first launched in 2010 and at the time was one of the world’s earliest and most innovative open data platforms.

The Library aims to be the definitive catalogue of place data for London – including environment, buildings, and demographics – creating a single, vital resource for researchers and data users seeking rich contextual insight for data services and projects. It takes an innovative approach by connecting, not collecting, datasets held by key London partners starting with Transport for London, the Department of Health and Social Care as well as Barnet, Brent, Camden, and Redbridge councils, and the Office for National Statistics. This collaborative working helps build London’s data infrastructure while acknowledging London’s breadth and large number of organisations that keep the city running.   

Over its 15-year history, the previous London Datastore, which the Library will replace, pioneered new ways of making public data accessible and useful to communities, policymakers and innovators. The Data for London Library builds on that legacy, offering more than 5,100 datasets, faster search tools, and improved discoverability to make it easier for everyone – from citizens to researchers to startups – to find and use trusted data that benefits Londoners.

Data from the London Datastore has been used to: 

• Improve air quality by collating data from air quality sensors across London to help map and predict air pollution episodes. This enables us to issue pollution alerts for Londoners, helping people with health conditions sensitive to pollution live healthier lives as part of the Breath London project.
• Support Net Zero by providing energy efficiency data for all London homes in a transparent, shareable way through the London Building Stock Model. This helps councils to identify and prioritise homes that need retrofitting and is a key tool to support the delivery of the Mayor’s Warmer Homes London programme with London Councils.
• Tackle rough sleeping by publishing quarterly and annual CHAIN reports based on data collected by outreach teams and services across London. These reports provide strategic insights into rough sleeping trends, supporting public understanding and helping the Mayor, councils, and charities work toward the goal of ending rough sleeping in London by 2030.

By making it easier to find and use data held across the city, in one place, the Library becomes core infrastructure for the current AI revolution by addressing a key challenge facing innovators – discovering where datasets are. Better access to datasets enables better insights to enable preventative services, new digital or data tools to support public service productivity and opportunities for innovators across public, private, research and civil society. London's approach to building the new data platform will be made available for other UK cities and regions to adopt.  

London is Europe’s largest technology hub – the second largest in the world – and now firmly established as a leading player on the global stage due to the way it uses data to improve services, education, research and innovation to benefit communities across the capital. London is also at the forefront of AI research and top three globally for venture capital investment into this technology. 

The recently published London Growth Plan identifies huge opportunities to turbocharge the capital’s economy by harnessing the potential of rapidly growing tech sectors such as AI. The Data for London programme will help to support this by improving city data sharing, increasing collaboration, developing public trust, boosting Londoners’ digital skills and leading modern connectivity.   

Theo Blackwell MBE, Chief Digital Officer for London, said: "London is great at collaboration and the new Data for London Library is rooted in partnership. We’ve been working closely with the data community, the London Office of Technology and Innovation, local authorities in London and other data providers in the city to prioritise the features and improve the user experience."

"This is just the beginning, we are only going one way – there is no global trend towards less data. AI systems of the future are heavily dependent on the quality and quantity of the data they are trained on, so our focus now is to build more data sources into the Data for London Library and to make it easier to navigate complex data sharing agreements to benefit the city’s strategic position as the vanguard of the data and AI revolution. This is how we can build a better, fairer, more prosperous London for everyone."

Eddie Copeland, Director at the London Office of Technology & Innovation, said: "Successfully tackling many of the biggest issues we face in the capital, from climate change to tackling homelessness, depends on bringing together data from many different sources. The Data for London Library and platform will provide a huge boost for our ability to join up, analyse and act upon data at a truly London scale to benefit Londoners." 

Director of the Open Data Institute and Data for London Advisory Board Member Stuart Coleman said: "At the ODI, we advocate for practical, well-governed data infrastructure that makes it easier for people to access, use and share data. The Data for London Library shows how the public sector can take steps to make datasets more discoverable and usable. By opening up access to data from across the capital, it offers a pragmatic model that others can learn from. As the National Data Library develops, examples like this can help demonstrate what works in practice, particularly when it comes to improving interoperability, making data AI-ready, and building on existing foundations rather than starting from scratch."

Dr Cosmina Dorobantu, Data for London Advisory Board member and Senior Advisor and Visiting Professor in Practice at the LSE Data Science Institute, said: "As a member of the Mayor's Data for London Board and someone who is helping to build a world-leading institute for AI and the social sciences here in London, within the London School of Economics and Political Science, I am tremendously excited to see the launch of the Data for London Library. Today's launch is an important first step towards making the vast amounts of data collected in London more accessible, and towards increasing the data maturity of contributing organisations. The foundations that the team behind the Data for London Library have built are essential for creating the invaluable data resources that businesses, researchers, and policymakers need to build a better, more prosperous, and more equitable city."

Muniya Barua, Deputy Chief Executive at BusinessLDN, said: "The launch of the new Data for London Library marks a significant milestone in the capital’s ambitious growth plans. It puts a wealth of up-to-the-minute public and private sector data at the fingertips of businesses and policymakers which can be used to drive innovation and transform the lives of Londoners. Having long championed the transformative potential of data sharing, we now look to the Mayor’s spatial strategy, the London Plan, to ensure it supports the development of critical infrastructure – from data centres to improved broadband connectivity – which will enable the benefits of this new platform to be maximised and London to lead the way in AI and other cutting-edge technologies."