It's good that you were at the end of a phone Allie and excellent news that K now has PR for KL.
Does the birth father already have PR, if he was ever married to KL's mother, he automatically has PR and that may explain why he has a copy of the sw report (if indeed he does, seems very odd to me). As K now has parental responsibility and must be a party to the proceedings (legally that is) he should get copies of reports.
If private law matters become complex, the court sometimes appoints a Children's Guardian to represent the child/young person. The CG appoints a solicitor to act on behalf of the child and given your grandson's age, I'd expect his wishes and feelings to be acted on, unless there is very good reason for them not to be. Most of the family Judges are very experienced, balanced, fair and child centred in their work.
Incidentally on Nonnie's point about reports not be altered even if found to be incorrect, it's true that reports can't be altered. THey can and should be subjected to an addendum report that corrects any previous inaccuracies.
Best of luck with this Allie.