The Fleet Solid Support (FSS) programme has achieved a pivotal milestone with the successful completion of the Critical Design Review (CDR), marking the transition from design to manufacturing for the Royal Fleet Auxiliary's next-generation support ships.

The CDR, an essential stage in the shipbuilding process, provides the green light to begin physical production of the three FSS ships. This comprehensive Ministry of Defence (MOD) review assessed the complete, detailed design of the vessels, from hull structure to equipment fit. The Review covered overall structural integrity, safety standards, environmental sustainability, risk minimisation and military systems integration.

The successful CDR follows October 2024's Preliminary Design Review and was marked in both Belfast and Cádiz, where UK technical teams have been participating in a knowledge transfer programme. This programme enables British teams to work alongside their Spanish counterparts, learning advanced shipbuilding techniques and processes that will be implemented in the UK yards.

Keith Bethell, DE&S Director, Maritime Environment, visited the Harland & Wolff shipyard to mark the CDR milestone and witness the ongoing transformation of the Belfast facility. He commented: "I was impressed by the scale of transformation underway in Belfast, seeing firsthand how we will deliver this world-class capability and meeting individuals central to the programme. This important CDR milestone brings us closer to ensuring the RFA can support our naval operations worldwide, whilst strengthening sovereign shipbuilding for years to come."

The three ships being built for the Royal Fleet Auxiliary under the FSS programme will deliver vital supplies to Royal Navy warships. Each vessel is 216 metres long – the length of two Premier League pitches. They will be the largest UK military ships with the exception of aircraft carriers.

CEO of Navantia UK, Donato Martínez, commented: "CDR confirms the hard work and collaboration between MOD, BMT and Navantia UK. This milestone demonstrates that the programme is ready to meet its operational, logistical and efficiency needs as it gears up to deliver for the Royal Navy and RFA."

Ian Randles, the FSS Chief Engineer at the Ministry of Defence said: "Completing the Critical Design Review represents a significant achievement for the Fleet Solid Support programme and demonstrates the strong partnership between DE&S, Navantia UK, and BMT. This milestone gives us confidence that we're on track to deliver these vital support ships that will enhance the Royal Fleet Auxiliary's global reach and ensure our naval forces have the logistical support they need wherever they operate. We're now ready to move forward with cutting steel and beginning construction of these advanced vessels."

BMT has leveraged its expertise in commercial and naval design, along with its knowledge of clean maritime, to deliver the functional design for the Fleet Solid Support (FSS) ships. This design is adaptable to counter evolving global threats and integrates energy-saving technologies, future fuel flexibility, and emission-reduction systems to support the Royal Navy's Net Zero 2050 objectives. Looking ahead, BMT will continue advising on design evolution, develop through-life support and training packages, and lead safety, environmental, and security accreditation through to vessel acceptance.

Catriona Savage, BMT's FSS Programme Director, said: "We are proud to have collaborated with Navantia UK and MOD to provide a safe, secure, environmentally- conscious, adaptable design, ensuring that the detailed engineering reflects the functional design intent as the programme transitions to production."

As a Sunday Times Top 100 UK apprenticeships employer, Navantia UK is committed to developing the next generation of shipbuilders. The company recently welcomed 73 new apprentices across its four sites, bringing the current number of apprentices to 222. Navantia UK plans to create 500 additional apprenticeships by 2030, demonstrating its long-term commitment to building the UK's future shipbuilding workforce.