I am a teacher in a high-achieving independent girls' school. I have worked in state schools and another independent mixed school. One of the state schools I worked in was in an area of deprivation and massively opened my eyes. At my current school we are entitled to 50% off the fees, so we have struggled financially to send both our DDs there to give them the best start in life. The opportunities are incomparable. The class sizes are literally half the size of similar state schools classes and (most) of the other students in their classes are extremely well-behaved, leading to a very safe and pleasant campus to be in, with happy teachers, polite, well-behaved students and excellent opportunities.
As a teacher, I do believe that bright children will succeed anywhere they are educated, but imho, the more children in the class, the less time the teacher can spend with each pupil. I have friends who are teachers in state schools - some of them have classes where the majority of students do not speak English, many have SEN requirements, some have behavioural issues and others are bright and require extra support. It's virtually impossible to cater for everyone's individual needs and you almost always end up spending the most time with the most demanding pupils, which can massively negatively impact the other students' learning.
I am envious of my daughters' education and my life would have been very different if I had experienced an education like theirs.
I am aware that there are lots of excellent state schools, but even simply for the class sizes alone, independent schools are often worth the money. They are not perfect and yes, with money comes a different set of issues. I don't want to come across as a terrible snob, but when I drive past our local comprehensive, it really scares me to think about my DDs going there and mixing with some of the characters coming and going. The buildings look awful and are in desperate need of modernisation. The staff look exhausted and depressed, and some of the parents picking up and dropping off look like they can't look after themselves, let alone their kids!
I have worked three jobs in the past to afford this kind of education and made a lot of sacrifices for their benefit. I just wish there were better state schools around, to give people more options, as it's completely unfair for hard-working, caring parents to have to send their children to schools which are failing.