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]