Hi MikeOz, I'm going to try and attempt to upload a few photos I took this lunchtime, bear with me if there are a few hiccups.
First of all, well done to you and Castlereagh Borough Council, for when I arrived at the cemetery, it was almost as if they were expecting me and one of the attendants took me straight to the grave. I hope no-one minds if I upload more than just the headstone inscription, in the circumstances I thought that some wider shots might add context and jog some old memories.
In the event, it turns out that the James Bailie headstone lies within the walled churchyard surrounding the church itself which has the oldest graves. Adjacent to the old churchyard is the main part of the cemetery with graves from the 1920s onwards, which accounts for most of the 6,500 graves - presumably this bit might well have been fields in your mother's time.
Anyway, photo 1 is of the front of the church, James' grave is to the left of the photo, obscured by bushes.