I had used this old posting to help me record some Kennoway BMDs.
I have now come across the correct date for the death of Barbara THALLON. She died 28 June 1856 in Glasgow, Scotland. Her husband was Robert JACKSON, who was still living at the time of her death.
There was another Barbara Thallon who was the daughter of Robert THALLON and Elixabeth GIBSON. I do not have any birth or death dates for her, however she was buried in Kennoway and Diddy's date of 1830 for the Barbara he mentions may well be the one. She may also have been married to Robert KAY and had twins, Robert & Isobel b. 1812 in Kennoway.