Applying for DD's primary school place on the council website
It asks if they have a sibling at the school, I said yes. They it asks for siblings name and DOB. I put them in and it pops up with the name of her school and asks if this is correct...I tried it with my friends child's name and DOB and it came up with her school.
So if you had a name and a DOB you could find the name of the primary school of any child in the county. And further than that, there is nothing stopping you from registering a non existent child just to get into the admissions application!