Sky News has been given exclusive access to a Met Police exercise in Poole Harbour, designed to develop and test counterterrorism plans. The simulated crisis - which is not based on any specific intelligence or threat - began with an alert from the Coastguard that a group of gunmen had launched an attack on a vehicle and passenger ferry as it crossed the English Channel from France. Read more: https://news.sky.com/story/counterterrorism-police-battle-ferry-gunmen-in-major-training-exercise-