I am not sure what records were made or kept for people other than children who were evacuated from school and records were made .Younger children like me were evacuated by parents ,in my case to my paternal grandmother’s family.
Records must have been kept because if the parents still in the towns were bombed and possibly killed ,the children must have become perhaps “ Wards of Court” and thus the responsibility of some authority or other.
Not sure about young adults.
I hope someone can give a better answer to your query .
Viktoria.