A treaty reserve could rotate old capital ships into new construction

A live tonnage calculation suggests that a 350,000-ton reserve allowance could preserve the principal British 13.5-inch-gun classes. The exact mix is counterfactual, but it could include Tiger, Lion, the Iron Dukes, the 1911 King George V class, and even the Orions. A later treaty cycle could move Queen Elizabeth- or R-class ships into reserve, dispose of the oldest group, and authorize new construction in 1930. The important mechanism is rotation: reserve status preserves depth without requiring every retained hull to remain indefinitely.