Thanks again Gaffy. I agree Victoria Barracks is a strong possibility, though the only entrance on the Clifton Street side was if I remember rightly at the end of Glenravel Street, so it seems strange that Clifton Street would be stated as the address. The main entrance was directly onto North Queen Street.
Not a big issue, just a point of curiosity so I will keep an open mind for now. But thanks for your help & pointers.
tc