The book I co-authored with Keith Robertson is back in print and available from The Scottish School of Herbal Medicine. The book is a short, but deceptively dense, historical account of herbal medicine in relation to the Celtic peoples. An extended version of the text with major updates and an additional herbal are in progress. Just don’t ask me for a date on when it will be ready.
To get a copy of the primer go to
https://veganherbal.com/