Department for Transport Maritime Security (formerly called TRANSEC).
DfT Maritime Security exercises the UK Government’s Designated Authority functions under the ISPS Code. It approves Port Security Plans in and sets the security level for all ports in the UK, UK Overseas Territories and Crown Dependencies, and for all UK ships and other British ships at sea. It has oversight of arrangements for dealing with all Ship Security Alerts. It approves ship security plans for and issues International Ship Security Certificates to all UK and other British passenger ships.