It's a good analysis but probably over-fixates on shipping specific factors. The UK also lost its car industry, its steel industry etc. The root cause in most industries is the same, there were just too many Labour supporters and the unions got too strong as a result. From the comments:

> I can relate to British union rules being head-bangingly stupid. In the mid-1970's I worked on the night shift as a spot-welder on the production line at the British Leyland car plant in Cowley, Oxford. By the book, only members of the electrician's union were allowed to touch the light switches, so when there was a "work-to-rule" the electricians would would decline to flip the lights on for the night shift—and so there was no night shift. Needless to say, BL went belly-up and now BMW is producing Minis there (although they are no longer very mini).

I grew up in the UK and it felt like everyone of my parent's generation had stories like that. My father was in management and had to go toe-to-toe with a union that was on the verge of wiping out his industry (private sector TV), they were doing things like shutting down transmissions as part of demanding higher wages. In that specific case the unions failed as the TV companies were able to automate the transmission suites and then fired all the workers, this was in the 1980s I think when the legal environment was more conducive to that. Funny story: one of the fired workers moved to the US and ended up writing a popular series of thriller books that ended up being turned into a movie series, he became very rich in the process. So the union failing ended up being good for that guy in the end.

But in many industries they weren't able to beat the unions thanks to a series of very weak left wing governments in the 50s, 60s and 70s (even the Conservatives were weak on labour until Thatcher) that largely made opposing the unions illegal. So the industries just got wiped out one by one. Today the same problem exists but with Net Zero instead of unions, it makes electricity so expensive that industry becomes uncompetitive vs parts of the world where they don't care, and the political class is fine with this outcome. Decades and decades of governments that cheered on deindustrialization for left wing ideological reasons.

So whilst the shipping industry probably did have problems in management (just like the car/steel industry), ultimately having good management wouldn't have helped. What determined if an industry survived this period or not was whether the management was able to automate fast and completely enough to break union power.