In my files are two poor photocopies of maps of Guyana (British Guiana) taken in Salt Lake City in 1997 but unfortunately I failed to note from which books they came. On one of these is marked Uitvlugt which is on the sea coast of the West coast of the River Demerara (in the Parish of St. Luke I think). By West coast I mean going up river from the sea i.e. on the right hand side.
"Tropical Cocktails" written in 1986 by Mike Henry, mentions that close to Georgetown are distillers such as Enmore, Diamond, Versailles and Uitvlugt. You could try and write to the distillers to see if they still exist and whether they have any information..