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Hi all,  I realise a lot of time has passed since this discussion, but thought it worth sharing my findings.  Thanks to you I pursued the question of Gray's Hall, specifically thanks to Archivos I managed to download the newspaper advert (attached) and thanks to the wonderful National Libraries of Scotland maps, found the Roy military map from mid 18th century which can be found at the link given below (free access). On the map you'll see Ceres (spelt Seerus on this map) and to the south around halfway between Ceres and Largo Law is Grayshall.  The map is not especially detailed but together with the description in the notice it does establish that there was a settlement called Gray's Hall nearby Windygates. I've spent a bit of time looking at the other maps on the NLS site but Roy is the only one that I can find mention of Gray's Hall.

Hope this helps

R

https://maps.nls.uk/geo/roy/#zoom=13&lat=56.2767&lon=-2.9460&layers=roy-highlands