I do indeed, I ought to have qualified my comment.
The British manufacturers simply failed to respond to the changing environment (notably American safety regulations and the declining sales of mainstream products in their home market) and the Japanese were more willing to develop products that competed.
All of the European manufacturers of "popular" sports cars were affected. No more Fiat X1/9s or 124s (they had one, but I've not seen any new for a while), no Volvo P1800, no Opel GTs, no Saab Sonnets, and what's most relevent in the forum, no more Healeys, Triumphs or MGs.
One of the best studies is: "At the End of the Road : the Rise and Fall of Austin-Healy, MG, and Triumph sports cars", by Timothy R. Whisler. Really academic with lots of graphs, statistics and analytical BS but it basically boils down the British management trying to milk a good thing for too, too long without puting anything back or doing anything new until too, too late.
No slight meant to Mazda, or Toyota, or Nissan, or....