There are several units and bodies that operate across the United Kingdom, for example Counter Terrorism Policing and National Ballistics Intelligence Services.
Mae sawl uned a chorff sy'n gweithredu ar draws y Deyrnas Unedig, er enghraifft Plismona Gwrthderfysgaeth a Gwasanaethau Cudd-wybodaeth Balisteg Cenedlaethol.