Thanks for replying. At last I found Glenhall on the Old Maps: just East of Dalsangan and North West of Crosshands, about 3 miles from Mauchline.
No, I don't have Nisbet in my family tree, but the Millers (Millars) who migrated to Australia lived at Glenhall in the 1851 census and I noticed that a Nisbet was also there. I thought other researchers may know where it used to be. Modern maps and satellite images show only fields where it used to be. My family tree has Crawfords from Loudoun Kirk as well. I'm not sure where the Millers originated from. Best wishes from Wendy