I’m going to let this one go.
Richard Hunter, archivist for Scone Palace, has replied, in part:
“I'm sorry I can't help directly simply because Scone Palace archives (presumably on the grounds of scale), never purposely retained any Estate records.”
Richard also mentioned and provided links for the Perth and Kinross Library service, the Tay Valley Family History Society and the Scottish Genealogy Society, all of which would require personal and/or paid research which I’m unable/unwilling to do.
Thanks to everyone who helped and/or took an interest in this one.
Cheers,
Peter