I'm thinking Umut is right in saying the great divide, the main class seperator, is education.
Blair was right...Edukashun! Edukashun! Edukashun!
It may have been money or family lineage in the past. But those "blue bloods" have been on the wane for some decades now. New Money has run society for several decades now, it's now time for New Leftism.
At this point in time, and developing for some decades now, is education, and the right kind of education, as one's roadmap to influence in elites driven society (ie the professional managerial classes). Look at the state of apprenticeship training in this country, laughable for time at least Tories have been in. Blair was complicit too, it was all about the magic barrier of 50% of 18+ going to college, not that the country cried out for plumbers and care workers etc. The scam and curse of that 50% is coming to fruition as DEI soaks up graduates with few life skills, no obvious jobs, and extended debt... who's gonna say no to a woke DEI related job if the market doesn't want your Gender Studies degree? Oh, sign your diversity statement to get that interview.
Because the West is now global (so many more Western middle classes come good, are able to run the mantra "Have Laptop, Will Travel" and work anywhere, even outside the UK) and allied to this, and contingent on it, is our post-manufacturing economy, as we've offshored all our making of things to China/SE Asia and other developing world.
That means eg the coal miner, who was an absolute icon of Britain as a country that created wealth by getting it's collective hands dirty, is now a distant memory, and carving an NHS out of nothing is an achievement of a bygone age.
Now, the middle classes absolutely rule strategically, as we become a society that purely manages the machinations of every day life, and media/woke hyper corporations rule commerce.Blairs codified human rights law and overqualified and underskilled 50% graduates market, now sealing the deal.
As Western societies give up substantive manufacturing and even cultural goodness (Marvel films power Hollywood), the professional middle classes via PMC fashion the terrain and the rules.
And thus power is wielded thru regulation on language, which has dual results of corralling us miscreants, and ensuring those in the system fly in the same direction, and fledgling PMCs (our Gen Z going into college and coming out with law and media degrees, and increasingly medicine ones) have nowhere else to go.
And because communication is even more Marshall McCluhan relevant than it's ever been, any dissenters ie GC women, white, even more so PoC and/or gays, have to have their English Literature marked, given straight fails, but a resit is always possible, and a pass given, if you tailor your answers "correctly".
Education, more than family wealth or skin colour, now matters the most. Because society is now in the hands of the most educated, yet if OU testimony versus Jo is to be believed, such a manicured and cultivated education ain't worth jack shit on the outside of these previously trusted and respected institutions.