I have 2dc, DS9 and Dd4. They both go private ( nursery all the way to secondary).
DS doesn't have a posh accent, he's been given a scholarship for secondary when he starts.
DD, will stay at the same school too.
The pro's for us, the classes are smaller, the school is small. When he finished nursery, I put him in a state school for reception, and he really struggled. Because he was able to read and he was advanced he was considered a nuisance and it affected his self esteem. I then took him out of that school and placed him in another school and he struggled as other children where getting certificates for doing the things he can do and the teachers didn't see that he needed to feel included. One award ceremony his whole class got a certificate for one thing or another (one child got a certificate for putting his coat on the right peg), my son just cried.
I took him out and put him back to his private school. And he doesn't feel like he is any different.
The cons are; because he's in a small school, there isn't that many children. One year, he was the only boy in his year. My DD will be starting reception in September and I'm worried that she will have no friends as her nursery friends are leaving to join state schools.
Not sure what I'm trying to say, just that there's pro's and cons. Both myself and husband went to a state school and he is naturally clever and I am not academically clever. I personally think, private schools are just the same as state schools but it's more to do with the size (I'm probably wrong here). It worked for us, but doesn't mean it will work for everyone.