What powers do the army have UK?

In the UK, the armed forces have the power to defend the nation against external threats and to support civil authorities in times of crisis, such as natural disasters or public emergencies. They can be deployed domestically or internationally under the command of the government. Additionally, the military can engage in peacekeeping and humanitarian missions, and, in certain circumstances, can assist in law enforcement operations, although this is generally limited by law and subject to civil oversight. Overall, their primary role is to ensure national security and protect the interests of the UK.