M Eley, regarding your interest in knowing more about the Scottish fencing style the main 2 references would be:
Thomas Page's "The Use of the Broad Sword" published in 1746 and availiable online at
https://linacreschoolofdefence.org/L...Page/Page.html
And Donald McBane's "The Expert Sword-man's Companion" published 1728 and currently available in print in a modern edit by Jared Kirby.
Donald McBane is primarily a small sword instructor but he does devote a small chapter to the broad sword.
Both authors only touch briefly on the use of the targe with the broad sword which has led to the Cateran Society
https://cateransociety.wordpress.com/ turning to the additional resource of the Penicuik Sketches in an attempt to recreate the system.
Robert