Residential breaks for autistic teens?

My son is 16 with ASD, anxiety, depression and PDA. As he is currently out of education, he is lacking focus and really lonely. He is also in a spiral of agressive behaviour towards us as he feels trapped at home. Does anyone know of residential holidays for teens with this profile? I think a change of scenery, getting outdoors and being with peers would be really helpful to his mindset. South west based (Cornwall/Devon) preferred.