Hi Derek,
It looks like Hugh Aitchison was actually Hope Aitchison. This looks like them in 1851:
Address: North Berwick House, North Berwick, East Lothian
Hope Aitchison, m, head, 61, forester, b. Dirleton
Janet ", f, wife, 52, forester's wife, b. North Berwick
1841 and 1861 (from Freecen) shows the same ... doesn't look like there was any children between them.
hume24