Becoming a doctor does not make you upper class in the UK. You can't really become upper class, at least in the traditional sense - certainly not through a job or money.
Edit: You could argue that everyone is middle class these days - almost nobody self identifies as working class and there are so few real upper class people (I've never met one).
Edit2: Of course, you used to be able to buy entry into the upper class. But that doesn't happen anymore ;-)
A doctor would happily take being middle class rather than being a lowest caste hindu dalit. The fact that someone can advance to middle class makes it vastly different from Hinduism where you and your future generations are doomed to be born in the same caste.
The lords system in England buys someone in your family a seat in the house of lords. It might mean you were born born with land that theoretically you have government rights over, but if you take that farther than changing competitive rents you will discover the powers haven't been removed only because it wasn't worth the bother since nobody used them.
That is my impression as an outsider anyway. I'm sure the details are different somehow.
https://en.wikipedia.org/wiki/Social_class_in_the_United_Kin...
e.g. David Cameron, Eton educated prime-minister, described himself as middle class.
https://www.bbc.co.uk/news/magazine-25744526
Edit: You could argue that everyone is middle class these days - almost nobody self identifies as working class and there are so few real upper class people (I've never met one).
Edit2: Of course, you used to be able to buy entry into the upper class. But that doesn't happen anymore ;-)