Welcome to UK LLC Guidebook#
Last modified: 12 Oct 2026
UK LLC is the national Trusted Research Environment (TRE) for data linkage in longitudinal research, bringing together data from Longitudinal Population Studies (LPS) and linking these to study participants’ health, administrative and place-based records. As summarised in the diagram below, UK LLC is committed to four nations coverage, is free to access and researchers can currently request access to LPS participants’ records linked to NHS England and geographic datasets (where participant permissions allow). Click on the links below to read more about:
UK LLC’s unique attributes - why you should consider UK LLC for your next research project
UK LLC’s ongoing development - expansion in partner LPS and data sources, and synthetic data and training TRE
UK LLC’s published protocol - explains in detail how UK LLC works.
If you are not a researcher, you may find this guide helpful: Where to find the information you need.
