Were you solely at private school or mix of both ? If both what were the noticeable, if any, differences ?
State school until 11, fee paying boys Grammar school 11 to 18
Enjoyed every minute of it, much greater discipline (parents signed a disclaimer allowing corporal punishment), better facilities, (both sport and educational, no book sharing etc)
Teachers took time and interest in everyone's education. Still some 'bad-boys' their but no one that was going to (be allowed to) disrupt or waylay anyone else's education.
Good range of contacts to be made (both social and commercial). Definitely a positive when placed on a CV. (One of the positions I held before tossing it off as a postie had directors educated at the same establishment and a second I was offered also!, Not nepotism as I also have B.Sc. but an advantage over other candidates!
My local comprehensive had a very bad reputation at the time which is why my parents made the decision to pay (a good decision as it turned out as a few of my old 'friends' where subsequently involved in the student strikes and riots there in the mid eighties (resulted in smashed windows and a few fires etc) not good.
Having said all this my son went to this comprehensive as its reputation and standing improved massively and the grammar I attended altered its administration (allowing girls in of all things!!!) not to mention increasing their fees to over £10k pa!
Believe they are now a state funded independent selective
school so if you can find something like that then best of both worlds!!
No idea of your finances or if you are hoping for a bursary but like buying a fast car a private school costs a lot more to run day to day as well and can't be based on being able to afford the term fees. (trips are likely to be more frequent, more exotic and much dearer. Sports the same, school meals the same etc etc )
To sum up imo, if the school your child is likely to attend as:
A) poor track record or reputation,
B) the catchment area includes an 'undesirable' estate
OR
A) your child as friends that might not be inclined towards education,
B) your child is easily influenced by their peers
and the private school you are considering is a good one then go for it.
BTW I was a day pupil so didn't miss out on parent 'time'
Remember educational establishments can go down as well as up, they are only as good as the administration and the pupils.