Hi John
I am a Foster Carer and things are much more formal these days!
A Child's Casebook could include reports from Social Workers, Medical professionals, Foster Carers, Parents, School and police if relevant.
I would be surprised if any files still exist for the years you are interested in, and they would be nowhere near as comprehensive as today's. I believe the 100 year Privacy Law comes into play. Plus only the child would be able to apply to see any records, which obviously is not possible in your case.
Sorry to not be of more help.
Regards
Giggsy