Colin,
Not forgotten...but cannot find any of my Salmon flies (moved 5 times in 7 years so may have lost them)..but...some good news I hope.
I had a word with David Irvine of Drum last thrusday night over dinner (thanks giving meal with a local american celeb..lol) and he informed me that firstly, the Drum Lightening was created by his uncle and as the Castle is shut for the winter, he will go and get some photos and the diary which documents its development and first fish!
Better still, when the castle was put in trust, all Davids fathers tackle and guns where sold off, but not before photos where taken and items documented. Well, the fly chests where all photographed and the contents catalogued. He is going to dig out the documents and give me a copy for your website. Hopefully it will answer some of your questions. Also, the surgeon he sold the flies too lives in Aberdeen, he is going to try and get in touch with him to see if he still has the collection.