Following publication of the UK's first PNT Policy Framework to ensure resilience in its PNT infrastructure, NLAI will provide strategic support to the UKSA and the National PNT Office by updating key policy input sources to the SOTA (State-Of-The-Art) assessment, used to support business cases, decisions, planning, and preparedness actions. SPARK will undertake a review of the current PNT services offered in the UK including any emerging or future services. These results will inform the implementation of policy decisions within the UK PNT framework to enhance the resilience of PNT services used in both UK Critical National Infrastructure (CNI) and non-CNI applications.