Britain's narrow base of nuclear-certified shipyards

Other than Barrow, which British yards retain nuclear certification, and is that capacity sufficient?

Barrow remains the principal construction yard, while Cammell Laird is identified, with some uncertainty, as the other certified facility in a highly specialised industrial base.

Barrow-in-Furness is Britain's central nuclear-submarine construction site. Cammell Laird is identified as the other yard retaining relevant certification, although that status is qualified from memory. Recent civil nuclear test-rig work and the production of ballistic-missile-submarine components show how certification can support specialised tasks short of assembling a complete boat. Certified cranes and other dedicated infrastructure leave national capacity concentrated in very few places.