The security-focused proposal continues production of 15-inch and potentially 18-inch guns for land fortifications, preserving heavy-ordnance skills while adding coastal defences. Standard layers of heavy and lighter guns would protect important bases, with Scapa Flow's concrete works providing another opportunity for earlier investment and employment. Greater elevation from fixed land mountings could extend the reach of large guns across nearby sea routes. Fire control and, when available, radar would strengthen those positions further. The industrial and defensive benefits would come from sustained preparation before a crisis.
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Coastal artillery as an industrial and operational reserve
Building heavy guns for Gibraltar, Singapore, Malta, and Scapa Flow could preserve ordnance expertise while giving fixed defences greater range than shipboard mountings.