pcordnsuch I had the same worries about my oldest lad (he’s 7 now).
We were at the park one day (he was four at the time about a month before he started school) when some foreign kid started tapping him with a stick. My son said “stop that please it hurts”. So this kid carries on (in full view of his own parents) & starts hitting my son harder. At this point I was ready to snap the kids neck & knock out the teeth of his lazy useless parents who were watching it happening but we’re doing nothing about it.
Until I noticed my sons face. He took the stick from this older child & hit him so hard round the head with it he was left barely conscious on the floor. Only then did this kids parents decide to do any parenting but turned on my son. They got told in no uncertain terms what my opinion was. I had thought that there would be a language barrier but it turned out they were/are resident in this country & they and their child spoke perfect English.
Goes to show parenting standards differ greatly across nations/ Europe.
Schools don’t seen to have power within the law/ legal backing to be able to properly deal with this behaviour in a way that is long lasting and effective. I worry more for when he goes to senior school.