About the improvement of the average quality of life (or richness) during the industrial revolution, I'd say that it was a quite long and much dialectical process (ask the luddites),
I do not contest this point. It still is an ongoing process, puncutated by fits.
influenced mostly by factors who had nothing to do with free markets (empire, class struggles, technology, market manipulations, etc).
I do contest this point. The rise of free markets are intertwined with the breakdown of class privilages, even though that does take generations. Furthermore, the development of technology is
provablely not possible without a concurrent increase in many freedoms, and particularly economic freedoms. The freedoms of markets cannot be seperated from the freedoms of the public, because not only are they co-dependent, the markets
are the public. Every market is simply the sum total of the individuals who participate in the trade within that market.
And the fact that the industrialization had to recourse to massive expropriations by state violence in order to start negates anything free-market about it.
There is no evidence that state expropriations were a pre-requisite, and much evidence that it is not. Despite British contributions to the Industrial Revolution, a great many advancements during the Industrial Revolution were developed in places that did not engage in the suppression of the lowest classes to achieve these ends. London begot so many advancements because it was the Silicon Valley of the age, attracting the self-selecting inovators to the same locale in order to learn from each other, like the world's first makerspace. Britons did not have any particular quality of people or state that granted them the advantages, it's just that if your dream was to be the next great scientist or inventor, London was where you went if you could manage it, or New York if you could not. Just like Seattle was the place to go if you wanted to be the next big alternative music artist during the 1990's. It wasn't the place that held the attraction, it was the people who were already there already doing those kinds of things.
The fact that London was (and remains) a major investment finance center certainly didn't hurt matters, either; but was not the major contributing factor.