The evidence for preplanned Glen conversions remains circumstantial

The central puzzle is how selection, prepared designs, and conversion all proceeded unusually smoothly. The Admiralty's disappointment when Breconshire failed its survey suggests that planners expected to obtain a fourth useful hull. Those clues make pure improvisation feel less persuasive than some form of advance preparation. No surviving document proves an agreement between the Admiralty and Glen Line. The evidence supports a historical inference, rather than an established fact.