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Submarine sustainment (FMSP)

Sustaining the entire UK submarine fleet 

Through the Future Maritime Support Programme (FMSP), we continue to sustain the entirety of the UK鈥檚 submarine fleet and support the Continuous At Sea Deterrent.

In 2021 we finalised the FMSP contract with the UK Ministry of Defence (MOD) to continue our support spanning UK naval base operations at HMNB Clyde and HMNB Devonport, alongside UK surface ship fleet and submarine support. This includes delivering through-life support and life extension of Vanguard, Trafalgar and Astute Classes of submarine.

FMSP is worth around 拢3.5bn and will run until March 2026, replacing the previous Maritime Support Delivery Framework (MSDF). This complex contract reinforces our position as a leading naval business with specialist expertise which ensures the Royal Navy goes to sea safely by delivering reliability and increased platform availability, alongside innovative marine technology solutions.

All of this increases value to our customer and underpins our Strategic Partnering Programme with the UK Government and MOD across a number of critical programmes.

At a glance:

  • FMSP is a 5-year contract, worth around 拢3.5bn
  • Includes UK naval base operations at HMNB Clyde and HMNB Devonport
  • Includes UK submarine and surface ship fleet support
  • We sustain the entirety of the UK鈥檚 submarine fleet
  • Delivering through-life support and life extension of Vanguard, Trafalgar and Astute Classes

Vanguard Class Life Extension Programme

Working closely with a number of agencies and partners, including the MOD, Submarine Delivery Agency, Defence Equipment and Support, commercial partners and ship鈥檚 staff, we deliver significant programmes of work for Vanguard-class submarines at our Devonport facility.

These are highly complex and critical programmes, and the life extension activities are platform wide, covering revalidation of the structure and through boat systems. Significant capability enhancements are also installed and integrated, which can include the replacement of motor generators and upgrades to communication systems and strategic and tactical weapon systems.

In 2023, Devonport welcomed Vanguard-class submarine, HMS Victorious, for her planned major refit.

HMS Victorious鈥 arrival was in tandem with significant investment in the naval base鈥檚 facilities, creating additional jobs for people in the region. As well as supporting the maintenance of existing and future classes of submarine, it will also enhance Devonport Dockyard鈥檚 ability to deliver major defence projects.

HMS Victorious and the rest of the Vanguard fleet are key components in the UK military鈥檚 longest operation 鈥 Operation Relentless. Since 1969, at least one nuclear-armed ballistic missile submarine is maintaining the continuous at sea deterrent posture at all times, deterring the most extreme threats to the UK and our way of life. The Vanguard fleet will be replaced by the Dreadnought-class submarines from the early 2030s.

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