Colleague of mine is looking for a very good independent school for his academically average boy. Child has flashes of brilliance from time to time but rather lazy so dad looking for school that will stretch him/keep him on his toes. So basically not Eton, but not Shiplake either. Colleague leans more towards traditional type boarding schools.
I was going to suggest Oundle but looked on gsg and now not so sure, does Oundle do well by average boys ?