Hi happyhunter and Imber
I must apologise as I have been meaning to update this topic. Your suggestions are appreciated the NLS website is excellent, although unfortunately Glenfield isn't marked on the maps, and the info about the toffee shop owners is good to know for when I next visit Moffat.
With help from Garrod I have been given the info below by a member of staff at the Dumfries Library Archive, I think is probably the nearest I'll get to the answer:
I have had a look at the original pages for the 1881 to 1901 census and Glenfield is listed as being on the west side of the High Street, between the end of Church Street which is now Number 21 called Annan View and Annanside and Garthland which are the two older cottages at the top of Annanside. In the 1891 census there are five households listed and two uninhabited houses at this address occupied by 5 people and by 1901 there are 7 households occupied by 36 people and now called Glenfield Square. There is a long low building at the top of Annanside which in is now a works but by its form was perhaps converted from housing in the past.
I think this is as close as I can get to where Glenfield Square was situated. I have marked this with a red oval below.
I haven't been able to include the map but the red oval didn't survive the send button in the right place!
I'll mark this as completed now, with thanks to all who helped.