The UK Longitudinal Linkage Collaboration (UK LLC) is the national Trusted Research Environment (TRE) for longitudinal research in the UK. UK LLC provides record linkages as a service to UK Longitudinal Population Studies (LPS) and a secure mechanism for researchers to access highly diverse and granular longitudinal data from many of the UK’s leading studies all with systematically linked and pan-UK health, socio-economic and place-based records.