Have you lost a Willliam Thomas Davidson from Co Antrim(?)?
I think he was born 1869 in Ireland, went to University and then joined the army. Then - for whatever reason - he changed his name.
I can find him in the records under his new name Thomas William Harrison, but have no definite facts before this.
If you have a Davidson ancestor who has 'disappeared' please
get in touch with me. I would be delighted to hear from you.