I have two in secondary school (currently £22k each year per child). Both went to a local village state primary school.
I think the question of what it’s worth is highly subjective. Both my children are very academic (both were greater depth across all indices when they left primary and both got academic scholarships). They achieved that strong basis through the state system, and had they gone to state secondary, I still think they would have done well. They might not have got quite as good GCSE grades as they are both on track to get now (both predicted all 7-9 grades across all subjects), but I don’t think top grades mean everything tbh.
I toyed with the benefits of simply saving the money for their futures, and I can still see the benefits that that option could have afforded them. What I think I am paying for though, and why I think it is still worth it, is the following…
(a) the best opportunity I can provide for them to achieve their academic potential (small classes, good resources, happy teachers, a peer group that is (typically) pretty bright, invested, and not disruptive, etc.)
(b) A broader range of extra curricular activities, sports and trips. (My children are very into sport, which I appreciate could also be sought outside school, but I do find that their school gives them a lovely intro into most sports and depth where they want to focus)
(c) the best chances I feel I can give them to enjoy education for education’s sake (for example, they both studied four languages until year 9, including Latin, which they both enjoyed, even though they have both chosen to pursue only one language at GCSE)
(d) Teachers who have the time to be very engaged with parents and who are able to invest time and resources in children’s bespoke strengths, interests and needs
(e) the best chances I feel I can give them to have the skills and confidence to launch themselves in the world independently. Of course this is also possible at state school, and of course only time will tell if investing in property would actually have served them better in the long run. It’s a gamble. But as far as gambles go, I feel investing in their education, skills and experiences is probably a good one.
I would like to add that I am not at all naive to the fact though that some of their primary friends who went to the local state secondary are also predicted to do very well. My children are still very good friends with a lot of their primary school friends, so I see them and their families a lot. I also find the balance that their mixed friendship groups offers them to be a huge asset for them, and I hope those friendships will last into adulthood.