Old shipyard capacity cannot simply build modern warships

What should Britain do if its entire pre-treaty warship industry and supply chain reappeared today?

Modernize the yards and retrain the workforce first, then place modern orders and use surplus capacity for exports.

Even if the old yards, suppliers, and personnel reappeared intact, modern warship orders could not begin immediately. The government would first need to upgrade facilities and reskill the workforce for contemporary construction. The expanded industrial base could then serve domestic orders and possible exports. Its tools and skills would have to match contemporary ship designs.