I may have answered you before? Although it’s an SEN school they have a unit in a mainstream school
My daughter was at Clarendon - well worth looking at. It was an excellent school when she went and the HT and some of the staff are the same. She has severe ADHD but it was undiagnosed at the time and they treated her as if she had it - ie appropriately - also she has a social communication disorder so borderline ASD. They have an offsite unit for ASD at what used to be Whitton School (Twickenham Academy?) Used to be in Hampton but I think is now in Richmond - in the grounds of Richmond College?