Help bit stuck

Long post sorry, my son has been at a special school unit for over 2 years. In those 2 years he has maybe been at school 3 months in total. He started going 1 hour day and built up to 3 hours a day

He never went into the classroom, then they let him in 10 minutes a day. Therefore, at school he has built no lasting friends and not learning social interaction. He really struggles with this and his go to is hitting, kicking. He can go from 0-100 in seconds (note due to this it is difficult for other family member to bring their children, round and some have stopped their children going near him)

To increase his timetable, we were told he needed to be more in class and be able to do his work within the class environment.

The school stated they did not have funding from the local authority for 1:1 so they had limited resources to manage his needs.

The end of last year we had a meeting with the school as they did not change his environment or adapted anything to meet his needs. The time in school had become stale.

Once they tried some new things, suggested by us, there were slight improvements but not much.

He has gone back this year, and they have increased his time to 4 hours. Where he interacts with other children, and he spends time in class.

His time in class is going well but at play time he is becoming very angry quickly it has resulted in him throwing things, hitting and kicking.

Questions:

1. Has anyone else experienced this with school where due to funding and lack of help from the local authority, they are under resource to meet their needs? If so, where did you go to seek help with this?
2. Has anyone else is child had issues with hitting and how have you helped them with this?