UPDATE phase 2 will develop an MVP of a UK National PNT Digital Twin. The digital twin will provide “quasi-realistic model” of PNT services services across the UK (including GNSS, ELORAN and the NTC), informed by service status data, that looks, operates and behaves comparably to actual PNT services throughout the UK. The outcome of the project will be an open and modular PNT DT architecture to allow future expansion. It will be flexible and extendible to adapt to the modelling and analysis needs of the UK PNT Office. The UK PNT Digital Twin will provide quantitative data to support planning for the future and decision making where the Twin supports and informs operational resilience and system deployments.