Merchant shipping built around logistics

What merchant ships should Britain prioritize to rebuild maritime capacity?

Roll-on/roll-off ships, container vessels, and a mix of short-sea and long-range tankers, because logistics determines whether forces can actually be used.

A balanced merchant fleet needs more than one ideal hull. Roll-on/roll-off ships provide flexible vehicle and military lift, while container ships carry the standardized cargo of modern trade. Britain would also need smaller tankers for rapid North Sea routes and larger tankers able to bring fuel from farther overseas. A weapon or formation has little value if fuel, stores, and transport cannot reach it. Deployability and endurance therefore matter as much as the headline size of an army or navy.