Back in the day we had a unit run by a nun...She got the girls in her tender care down on their knees scrubbing floors so one former inmate told me..I do know that no one wanted to be referred back to her in particular and other units in the 70's and 80's.Sadly under Mrs T they were seen as being too expensive despite their effectiveness(well in Pompey anyway)and many were closed.
The newer units well they work for some but not for all.The trouble is that many of these students should have got one to one education much much earlier in their school lives.It's too late for most 15/16 year olds who are troublesome.