right i will try and do this the short way:-
ds1 is 8 and some of you may know he has sn and is statemented at school
you may remember we moved ds1 and ds2 to a different school earlier in the year, as we had a few issues with the old school, one in particular being a girl who is more of a problem child by the look of it, used to hit, slap, punch and push ds around, in his old school she shoved a pencil through his jumper and used to pinch his things, we didnt get satisfactory outcomes to most of this, however our big concern was that for some reason his one to one teacher used to sit with this girl instead of him, which is so totally wrong as she was funded for ds and him only, this is where we feel he fell in further behind than he already was, we had looked at a special needs school but he didnt want to go.
so we kept him in mainstream with his brother which they both love the school was fab at first and he has made progress and we are so proud of him, ds2 has also made good progress. They promised us we would have no trouble here and they would always listen to our concerns, he has been held back a year at our request and they wanted to anyway, however within a month and a bit this girl suddenly appeared at his new school and started saying to him my mum said i have gotta sit with you, one its very strange she is following him they seem to have a weird obsession with him, (they also held her back even though she isnt statemented) and is now in the same class as him again 
, they said they would keep them apart, but she kept hassling him and still sitting next to him, drawing over his work, smacking him again, cut his jumper with scissors 
, and yesterday grabbed him round the back of the neck and started shoving him hard to the floor even though he kept saying stop.
We think they moved and the mum was saying sit with him just so they could his one to one teacher again at this school, they assured us they have nothing to do woth each other even though she seems to be in a group to help people with the statements
dp spoke to school and apparently she isnt a bully blah blah blah, so nothing is basically going to happen, now we fought so hard years ago to get this statement, and have been fighting on his behalf ever since for the right education, now this girl has already caused him to fall even further behind, they wont kick her out even after the 2nd scissor incident, now ds1 hates it there keeps asking why this horrible girl has followed him now he is asking to back to his old school, i just dont know what to do anymore he wants to go back to his old friends and away from her, as far as i can see we have three options - leave him and let him keep suffering, move to a new school again, or back to his old school if we can come up with the right plan for him.
i have probably forgotten bits but this is long enough as it is, we just need other opinions now, i know it may sound trivial but this really is a hard situation, everything is so difficult, we have had enough
thanks for listening xxx