The irony is that we make more cars in this Country now than we ever did. Just that the profits all go to the Japanese.
I don't blame poor business plans, poor workmanship, poor management and certainly not poor engineering (in the 1970s we were still leaders in that, and there is an argument for saying we still are). Down to the unions and, as a consequence, lack of investment in R&D IMHO.
Cars in this Country, until the 1990s, were being made with virtually no development to try and make a quick buck to pay for the Unions' ridiculous demands for 'their members'. The unions ultimately won and 'their members' all lost their jobs. Then our car industry was no more, until the Japs saw an opportunity to use the considerable skills and knowledge they all had.