Operation Plato is a British omnibus governmental protocol enacted in the event of major national or regional emergencies requiring the immediate coordination of multiple first responders and national governmental echelons; most notably Cabinet Office Briefing Rooms (more familiarly known as Cobra) is convened. The Joint Operating Principles (JOP) automatically come into play [1] – NHS trusts activate their major incident plans, for example. It was most recently activated (by the Greater Manchester Police) [2] for the 2 October 2025 Manchester synagogue attack on Yom Kippur [2] [3]