Yes, good spot [?guess !!] Philip.
Can't find any suitable place name here
http://maps.nls.uk/geo/explore/#zoom=15&lat=55.9492&lon=-3.5098&layers=168&b=1but earliest OS map seems to be 1880s.
ADDED:
National Records of Scotland
http://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/welcome.aspx have these plans, some are contemporary [no idea of scale]:
RHP6827 Sketch plan of Philip Thomson's farm of Ecclesmachan and part of Drumforth (1-2) 1778 Access conditions may apply - please click on reference to display details. Check details
RHP6828 Contents list of the lands, houses and inhabitants of Ecclesmachan, "by a New Argument and according to a Plan of these Lands" (1-2) 1785 Access conditions may apply - please click on reference to display details. Check details
RHP6829 Plan of the farms of Gateside, Three Miletown, Mounthooly, Auldcathie, Wrae, Trinlymyre, Lampinsdub, Waterstone, Drumforth, Hillend, Kirklands, and Ecclesmachan 1788 Access conditions may apply - please click on reference to display details. Check details
RHP6830 Plan of some houses and yards in the village of Ecclesmachan 1796 Access conditions may apply - please click on reference to display details. Check details
RHP11562 Photostat copy of sketch plan of the lands of Ecclesmachan 1785 Open
RHP14588 Plan of the estate of East Binny, belonging to Robert Stewart 1788 This record is Open. [has a reference to a Langdalehaugh....but it's in parish of Linlithgow]