Hi Paul, I’m researching the McKay family tree and the link below is one of only two references I’ve come across anything to support a family story of the McKay’s having a ginger works in Blantyre, the other reference being the marriage certificate of my great grandparent  in 1894 where John McKay’s job is a Bottler’s salesman. Do you have any other information?

https://blantyreproject.com/2016/09/mclean-bros-mineral-water-works/