Was talking to SIL during the week and she said she found the best way to remove them was plaster the hair with conditioner then comb out.
When you dry the hair use a hairdryer as this will help keep them away and don't wash the hair too much, they LOVE clean hair.
Use the vinegar rinse or spray bottle with lavender &/or tea tree oil.
If they have long hair keep it in plaits while they are at school. I found this really helped with my DD's

I think that we need to go back to the head inspection at school and not being allowed back until the treatment has been done and the council nurse has been seen. This way at least you know treatment has been started and then hopefully they are gone until the next cycle starts.