Membership of the EU was the prime reason why UK assets were sold to the highest bidder or goods bought from the lowest priced source. It was the legal requirement. We are now "reaping that whirlwind".
As to the Tyne in particular I cannot help point my finger at the Unions and their contant strikes and pay demands. That played into the hands of countries able to build ships at a better price.
The Unions still rule with this "Commie" government.
Whilst some of this is as a result of Socialist ideals I cannot forgive the Tories for not taking the Brexit opportunities.