Specialist schools for children with ASD & dyslexia

My son 13 attends a small independent mainstream school with small class sizes.  Educational psychologist recently reported he has made absolutely no progress since he started there aged 11. He has a statement of special ed needs.  The school is not meeting his needs but there dont seem to be any alternative schools in S W Wales. The Ed Psych says he needs a specialist school with class size no more than 8 - he has high functioning autism and dyslexia, dyspraxia, dyscalculia so needs a school with similar profiles peers. Residential is not an option as he is v much a home bird and would not leave his dog apart from the question of huge cost. The lea would never stump up the funds. Any advice ideas would be great. Thanks Lou