Shockingout, it’s a shame you feel this way.
My child also attends Quainton Hall. I have found the pastoral care to be excellent, communication with parents is consistent and the new head Simon Ford has his finger on the pulse. I understand your point about cultural balance and this is a reflection of the demographic in Harrow now, according to Wikipedia Harrow's population is now 60%+ Asian, so you would expect a similar balance in the schools. Quainton does not select on race, it selects on ability from the local and surrounding areas. I would agree a few more kids from other backgrounds would be most welcome and hopefully the new head will address this, however places can only be awarded to those that apply.
I believe the reception class currently has 16 children, so yes there are four places to fill, however the smaller the class size, the better attention ratio they receive. This issue of filling places is not limited to Quainton Hall, private schools are an expense that many families simply cannot afford, particularly in the current economic climate. I am sure many parents would love the opportunity to give their children the best start possible and are unable to do so. Other local schools like Pinner Park or Marlbourough have class sizes of 30+.
When reviewing leavers from Quainton Hall versus other local private schools such as; Alpha, Reddiford, Orley Farm etc, you will see that Quainton is awarded more places to the top secondary schools, so if it is a good quality, balanced educating you are looking for, your child is in the right place.
I would encourage all backgrounds to consider Quainton. It definitely has some of the best facilities out of the schools we visited in Harrow and is very traditional in it’s approach. Just love the way the kids line up before going into school and say good morning to the teachers -they don’t just educate the children, they teach them good manners and politeness?