“The Home Secretary today publicly confirmed the existence of an organisation established to better understand the threat of hostile state activity and inform the government’s response.
The joint state threats assessment team (JSTAT) was created in 2017 in response to the increased and evolving threat the UK faces from hostile states.
…Like other independent assessment bodies, including the joint terrorism analysis centre, JSTAT reports to a governance board comprising senior officials from across the UK intelligence community and wider government departments. The Director General of MI5 has ultimate responsibility for the organisation.”
Hostile state activity assessment body announced (Home Office, link)
See: Joint State Threats Assessment Team (MI5, link)