HMS Tyne is a River-class offshore patrol vessel built by Vosper Thornycroft in Southampton for the Royal Navy to serve as a fishery protection unit within the United Kingdom's waters along with her two sister ships Mersey and Severn. All three were commissioned into service in 2003 to replace the five older Island-class patrol vessels.

HMS Tamar is a Batch 2 River-class offshore patrol vessel of the Royal Navy. Named after the River Tamar in England, this is the seventh Royal Navy ship to be named Tamar. She is the fourth Batch 2 River-class vessel to be built and is forward deployed long-term to the Indo-Pacific region with her sister ship HMS Spey.