Well, we have not gone!
On waking up this morning, DH said he spoke to DS last night and although this boy is responsible for DS's coat, it was not quite as he told the story to me.
DS made it sound that he was sat on the bus with coat on and this boy was sat behind and pulled the hood which was buttoned on, buttons flew off, tore material.
What actually happened - DS on bus, coat in his bag. Took the coat out of his bag to put in and the said boy snatched the coat off DS, DS tried to snatch it back and pulled it, this boy would not let go, DS pulled harder and that is when the hood thing occurred. Although a Yr10 boy did tell him off and he was cheeky back as DS said.
Now to me, it is still this boys fault, he should not have snatched the coat it does not belong to him. But DH thinks that DS should not have snatched it back - just ignored the situation and go upstairs to get the bus monitor.
I am a very "black and white" girl - no grey areas, DH thinks things through and has come to the conclusion that it is not worth going to see the parents as DS did some pulling also.
However, the bus monitor is a waiter where I work and he was there last night. I told him of the situation and he is going to give him a thick ear "have a word" with the said child.