I am afraid that from 1900 onwards British manufacturing was actually in decline, with the major competitors of Germany and the USA, followed later by Japan, taking many of the old Empire's markets with better quality and cheaper products being produced.
British engineering had become less and less competitive with the pressure from the trade unions to pay the work force higher wages, just when "rising sun's" like Japan had a very large and cheap work force going begging with an eager appitite to become the industrial might of the world. In the examples of ship building, railway locomotive building and of course the car industries, these market forces become too great for not only Britain, but Germany and the USA as well, with their heavy engineering capabilities being wound down as orders declined, workers demanded higher wages and health and safety became a growing issue. One example is the fact that Toyota is now the world leader of car production, beating all the efforts of Detroit!
This has of course continued into modern times, with now the likes of China taking the batton of mass production. Unless the working man is prepared to work again for poor wages, in dirty and dangerous environments, then heavy engineering will not in the foreseeable future return to our lands. Of course the likes of Britain, Germany and the USA now concentrate on the modern reality of the high tech industries and financial markets. I repeat this is the reality of today, which we must for now accept.
I personally regret the passing of the great days of heavy railway (yes, the likes of the great North British locomotive works and the Great Western Railway at Swindon, plus the rest!

) and ship building industries on the Tyne, at Belfast and elsewhere, but the facts are it has gone due to world market pressures. Life moves on, and many men are living longer due to the easier working conditions in the twenty first century. That has got to be good! 8-) 8-) 8-) 8-)