Hi Rachel, I know its a couple of years since you posted this thread, but I have just found it and hear is some info that may or may not be of use to you. I found this whilst trawling my way through the intimations in the Carluke Gazette from 1906. Sometimes the newspaper published an obituary or just a detail of the deceased.
DEATH OF SERGEANT JOHN EDMONSTONE: Sergeant John Edmonstone, Drill Instructor, passed away somewhat suddenly, at his residence, Drill Hall, on Friday evening last week. Deceased, who was 41 years of age, was a native of Cockenzie, Fife. Twenty two years ago, he enlisted in the 1st Battalion of the Highland Light Infantry and served with his regiment in the insurection at Cresta. Something like 8 years ago, Sergeant Edmonstone came from the depot in Hamilton to set as Drill Instructor to the Law Company of Volounteers and his work gave satisfaction to all concerned. A little over 2 years ago he was appointed Drill Instructor to "D" (Carluke) Company, 8th H.L.I., in which capacity he has since served. His illness only lasted for a few days and terminated totally on Friday as stated.
The remains of Sergeant Edmonstone were interred in Wilton Cemetery on Monday with military honours. The military party accompanying the cortege numbered over 200 and consisted of Territorials, Imperial Yeomanry and a party of Sergeants from the depot at Hamilton. The officers present were Adjutant Stevenson, Major Anderson, Captain Hunter, Captain Gibb and Lieutenant Gray. The coffin which was covered with many beautiful wreaths was carried to the grave by a party of Sergeants.
A short religious service was conducted by the Rev. F.M. Hauxwell. The parting salute was fired over the grave and the bugles sounded the Last Post. Deceased was of a genial nature and very popular with those he associated with. He leaves a widow and family.
I also came accross this death in October, 1918. EDMONSTONE: At Shotts Sanitorium, on 17th inst., Millicent Kate Edmonstone, daughter of the late Colour Sergeant John Edmonstone, Carluke, in her 18th year. This would put her born circa 1900 and I just wondered if she could have been your missing Margaret.
Hope this is of some use to you. If I come across any other Edmonstone info, I'll be in touch, but it may be some time yet.
Regards Allan