Linking data for future research discoveries
A new phase
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Strength in partnership
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Simplified data access
Read full storyWhat is UK LLC?
UK Longitudinal Linkage Collaboration (UK LLC) is the national Trusted Research Environment (TRE) for data linkage in longitudinal research, led by the Universities of Bristol and Edinburgh. It simplifies access to linked data for research in the public good, enabling discoveries through linked associations between health, social, behavioural, and economic research.
The data held in the TRE is provided by a wonderful collection of established UK Longitudinal Population Studies whose participants have been providing data on the basis they are used for research to deliver global benefits and impact.
UK LLC enhances the study-collected data by linking participants’ health and socio-economic data and data about the environments, neighbourhoods and dwellings in which participants live.
For participants
How UK LLC works for the public good
As a participant of one of the studies taking part in UK Longitudinal Linkage Collaboration, you have kindly shared data about yourself with your study to help improve health and wellbeing.
Read our promises to participantsFor researchers
UK LLC Explore: our data catalogue
UK based researchers can apply to access data held within the UK LLC Trusted Research Environment. Over 325,000 participant records from more than 20 established Longitudinal Population Studies are linked with health, non-health and place-based data.
View our data catalogueUK LLC Guidebook: our data documentation and TRE user guide
Whether you are a researcher interested in applying to access data, already working in the Trusted Research Environment, a Longitudinal Population Study data manager or an interested member of the public, our guide will direct you to find the information you need.
View GuidebookUK LLC Apply: our application system
Longitudinal researchers and analysts who use large datasets as part of their research and are interested in the depth of detail present in Longitudinal Population Study datasets can apply now.
Start an applicationUK LLC appointed to develop training Trusted Research Environment
29th Jan 2026
UK Longitudinal Linkage Collaboration (UK LLC) has been appointed by Population Research UK (PRUK) to develop a pilot training Trusted Research Environment (t-TRE) containing synthetic data, as part of an £850,000 project. Work is due to commence in April 2026. A novel t-TRE with custom training content In a t-TRE, researchers would be…
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UK LLC paper: Co-developing resources for better public understanding of Longitudinal Population Study Data and the Law
25th Nov 2025
UK Longitudinal Linkage Collaboration (UK LLC) have a new paper published on simplifying legislation on data use for longitudinal study participants. You can read the full news summary or the…
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UK-REACH is first Longitudinal Population Study to join UK LLC under broadened purpose
14th Aug 2025
UK Longitudinal Linkage Collaboration (UK LLC) is delighted to announce today that UK-REACH is joining as its latest partner Longitudinal Population Study (LPS). It is the first LPS to join…
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Office for National Statistics Accreditation
All applicants to our Trusted Research Environment must hold Office for National Statistics Accredited Researcher status or be enrolled on an Office for National Statistics Safe Researcher training course.
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Did you know…
We have ISO 27001 accreditation, a globally recognised gold standard in information security management.
Resource hub
A library of resources for our partner Longitudinal Population Studies
Did you know…there are a range of laws and legal principles involved in the use of data for research?
Find out moreWho gets screened? Linking data to better understand cholesterol screening in people with mental illness
29th Jan 2026
Naomi Launders is a Senior Research Fellow in the Division of Psychiatry at University College London (UCL). Her research is funded by Health Data Research UK (HDR UK). In this…
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How my interest in research led me to public involvement: From Psychology to data access
29th Jan 2026
Karen, a member of our Data Access Public Review Panel shares her long-term interest in research and how it led her to become involved with UK Longitudinal Linkage Collaboration (UK LLC). …
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