Schools specialising in PDA

Hello, this is my first post. 

My son is diagnosed Asd, PDA with sensory issues, he has an ehcp with a funded place at an independent school which said they specialise in pda. He has been there for over a year now and we still can't see that his sensory diet is being followed  

When we talk to teachers it's obvious they don't get pda, to the point we weren't able to show son his last terms report as it was full of demands. 

Increasingly he is being bullied at school  at first the teachers said there were no witnesses but recently there have been and the offender gets excluded for 1 day if we really make a fuss. 

Does anyone have some ideas of pda experienced schools around the Berkshire area as it's looking like we may have to consider a new school