What a wonderful surprise. I posted some time ago looking to fill in gaps in my grandmother's failing recollections.
I'm afraid that my interest is in the Aird family and not the Coopers, but I too had established that George was from Portsmouth. I had ascertained some dates of service in the police, although you probably have access to whatever you need in that department.
The only other fact I have regarding your grandfather is that he served in the Highland Light Infantry (possibly in WWI). Is it possible he was a musician? I have a regiment number too (14th?), but I'm on the laptop and it's saved elsewhere!
Your grandmother, Marion Aird, was my gran's Aunt Minnie. My gran, though now suffering from dementia, can still dimly remember her Aunt Minnie and her cousins Jim and Bill visiting after my gran's mother died.
The other Aird mentioned in the subject heading is your grandmother's other sister, who also married and moved to Bradford. I have no information on them.