Sustaining British steel and aviation capacity

What could government have done to keep British aviation and steel industries strong?

Maintain demand through cars, ships, and railways, then use tax incentives to make British manufacturing with British steel more competitive.

A steel industry needs customers large enough to keep furnaces, workers, and investment active. Domestic car production, shipbuilding, railway renewal, and new infrastructure could supply that demand. Government could reinforce the market by reducing taxes on goods manufactured in Britain with British steel. Such incentives would make domestic production more competitive without relying on a single military order. Aviation and naval capacity depend on the health of connected civilian industries and long-lived skills as well as the final defence contractor.