UK Armed Forces rely upon accurate Positioning, Navigation and Timing (PNT) information for a variety of critical applications. GPS, owned and run by the US Armed Forces, is our main system; as a tier 1 nation, we have privileged access to the most secure GPS signals. The Ministry of Defence (MOD) has a dedicated Research & Development programme looking at diminishing traditional PNT vulnerabilities. This includes key work with industry on research into anti-jam techniques (jamming is the most common form of PNT interference) and the £70 million Robust Global Navigation System contract to deliver Multi Constellation Open Signal receivers, further decreasing our vulnerabilities. The MOD is committed to a systems-of-systems approach to managing PNT vulnerabilities, including with cross-Government partners.