How an unrestricted capital fleet would cycle older ships out

Without naval treaties, how long would earlier British capital ships remain in service?

Sustained new construction would move them into reserve and likely remove the 15-inch generation by the late 1930s.

An unrestricted Royal Navy might stabilise near eight active battlecruisers and sixteen active battleships, backed by about eight reserve units. Continuous construction would move the oldest ships into reserve as each new group entered service. At a pace of four ships every two years, the 15-inch generation could disappear even from reserve by the late 1930s. The force structure depends on sustained replacement rather than keeping every earlier capital ship indefinitely.