I agree with TotallyBS. I wonder if they are referring to something similar to a railcard where an adult has to travel with child(ren).
None of the children who go to DD's school have an adult travelling with them. It is also worth finding out if your children are entitled to a free bus pass. We live in the catchment area of the school, but are over the three mile limit so DD gets a free bus pass.
We are moving and I went online to get a bus passes for my dc and saw that the bus company says that "children 13 & under cannot travel alone but must be accompanied by a full fare paying adult" - how are they supposed to get to school then I cannot take them and anyway they need their independence (do not qualify for LA transport).
I know loads of children who travel to school on service buses by the same company, including dd when she has gone to a friend's house after school - is this just something that is ignored generally? Is there a particular age when children can start using the bus alone / with older siblings (and any age for the older sibling)?