Five Years of Persistent Royal Navy Presence in the Indo-Pacific

HMS Spey and HMS Tamar, two Batch II offshore patrol vessels, left Portsmouth on September 7 2021 and have remained continuously deployed in the Indo-Pacific. Operating under Operation HIGHWALL, the ships patrol an area that stretches from the Indian Ocean to the western Pacific, providing the United Kingdom’s first sustained forward presence in the region since the 1997 Hong Kong handover.

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Together the vessels have logged almost 593,000 km (about 15 circumnavigations) and more than 30,000 hours at sea. Their missions have included monitoring United Nations sanctions on North Korea, counter-illegal-fishing patrols, multinational exercises, defence diplomacy, and disaster-relief operations. Notable humanitarian actions comprise delivering fresh water to Tonga after the early-2022 volcanic eruption and tsunami, and supporting cyclone relief in Vanuatu. The ships have also conducted freedom-of-navigation operations: Tamar sailed with the Royal Australian Navy’s HMAS Perth in the South China Sea in August, and later transited the Taiwan Strait—the first Royal Navy warship to do so since HMS Richmond in 2021.

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Because the vessels operate more than 15,000 km from the United Kingdom, maintenance is carried out primarily in Singapore and Cairns, Australia, while specialist personnel and replacement crews fly in from the UK. HMS Spey has completed 61 crew rotations and is currently undergoing routine maintenance in Singapore; HMS Tamar is participating in the US Navy-led Pacific Partnership 2026 humanitarian deployment in Malaysia. Crews rotate roughly every six to seven weeks, allowing sailors to gain extensive overseas experience without prolonged separation from home.

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The 2,000-tonne OPVs are armed with a 30 mm gun and lack missile systems or permanently embarked helicopters, making them unsuitable for high-intensity combat but valuable for lower-threat tasks. Their modest size enables access to ports such as Tahiti, Pitcairn, Timor-Leste, New Caledonia, and Cambodia’s rebuilt Ream Naval Base—locations where larger warships might be less appropriate. By maintaining a forward presence with a small crew complement, the Royal Navy can demonstrate diplomatic resolve, gather information, and conduct sanctions patrols at a fraction of the cost of deploying a frigate or destroyer.

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The deployment has proven that persistent forward-deployed patrol vessels can generate a diplomatic and operational footprint disproportionate to their size. While the ships remain “modest assets in military terms,” the Royal Navy plans to continue leveraging them under Operation HIGHWALL, with future rotations and maintenance cycles already integrated into the current support framework.

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