Thanks to all of you for your posts and pm, I have no further info to give. I will update you when I am able to post more.
Wayfare stranger, they owned a farm in Bushmills, eggs milk etc was sold locally, it wasnt a shop exactly, it was simply selling produce from the farm, you should be able to find records of the farm, but the shop was simply something which the locals used. Most farms have that. my cousins are still in that area, descended from Robert and William (both deceased) they will likely know more than me, if you try searching for the name Glass locally.
Ross.
