Why Elswick would develop a British 15-inch/45 gun

Which British works would develop a 15-inch/45-calibre naval gun?

Elswick, the established centre repeatedly used for new British naval guns.

Elswick is the immediate choice for developing a British 15-inch/45-calibre gun. New British naval gun projects repeatedly went to the works regardless of which company owned the site at the time. That concentration of specialist knowledge explains why an established ordnance centre would receive the project. Successive generations of naval artillery depended on continuity in this industrial base.