Why a Vickers triple turret would not guarantee adoption

Could Queen Elizabeth carry twelve 15-inch guns at 26 knots using triple turrets?

The design is treated as technologically possible, but British reluctance to adopt an untried arrangement makes it unlikely.

The proposed 26-knot Queen Elizabeth with twelve 15-inch guns is rejected as unlikely for this period. Vickers had a triple-turret design, so the objection concerns adoption rather than the existence of an industrial proposal. The Royal Navy is expected to insist on experience with a triple arrangement in its own service before committing to it in this class.