The Royal Navy (RN) has four River-Class Offshore Patrol Vessels that also conduct fishery protection activities alongside their Defence tasking. They are HMS MERSEY, HMS TYNE, HMS SEVERN and HMS FORTH. They are used to fulfil the RN’s commitments under the Memorandum of Understanding (MOU) with the Department for Environment, Food and Rural Affairs and the Marine Management Organisation, for fishery protection tasking.
These ships remain under RN Command.
The days spent at sea between 1 January 2014 until 30 September 2019 for all tasking; including the activity under the MOU:
HMS SEVERN (1)
HMS FORTH (2)