Hello Gwenan and welscome  

This was the Robert Jones and Agnes Hunt Hospital that later  became an orthopaedic hospital between Oswestry and Gobowen. I don't know much about it in the time frame that you mention as I was only about 5 years old but I think my aunt might have worked there as an assistant nurse by then.She retired in the l1960s.  Later, I worked there as a teaching assistant during the summer holidays when I was home from university. 
Much later both my father and mother had hip replacement operations there.
I'm not sure that I can help you but I confirm that it was there. If you can give some details of what you need support for, please tell  

Gadget