Welcome#

Last modified: 24 Feb 2025

Welcome to UK LLC Guidebook, the home of UK LLC’s data documentation and user guide.

UK Longitudinal Linkage Collaboration (UK LLC) is the national Trusted Research Environment (TRE) for the UK’s longitudinal research community. UK LLC brings together de-identified data from Longitudinal Population Studies (LPS) and systematically links these data to participants’ health, non-health administrative (e.g. education, employment, tax and benefits) and place-based records in the UK LLC TRE.

UK LLC’s protocol paper, published in the International Journal of Population Data Science, explains how UK LLC works. Currently, researchers can request access to data from 20 LPS, with participants’ records linked to NHS England and place-based datasets, where permissions allow. We anticipate NHS Wales and further place-based datasets being available in early 2025.

Please visit UK LLC Explore, UK LLC’s metadata catalogue to discover the breadth of data held in the UK LLC TRE.

To apply to access data please go to UK LLC Apply, UK LLC’s online application management system.