A November 1848 marriage notice found in various newspapers of timescale:
. Hugh Robertson, of Gartlock. to Margaret, eldest daughter of John Aitchison, Esq. merchant, Glasgow.
Also, two July 1849 deaths:
. Sauchiehall Street, on the Ist instant, James, second son. aynd Deptford on the 2d, Walter, eldest son of Mr. John Aitchison, merchant, Glasgow.
Likely index for Walter's death with surname variant:
Aitcheson Walter Greenwich 5 187
Possible family group in London at 1841, with surname mis-transcribed::
Walter Atchieson Male 40 1801 Scotland
Elizabeth Atchieson Female 30 1811 Middlesex, England
John Atchieson Male 7 1834 India
Walter Atchieson Male 4 1837 Middlesex, England
Elizabeth Atchieson Female 2 1839 Middlesex, England
Archibald Atchieson Male 0 1841 Middlesex, England
and fits for the grandson, Walter, in Glasgow at 1851.