My mother, Frances Skelton (née Aird) is Wendy's second cousin and my grandfather Lionel Aird was her father's first cousin. Lionel took a great interest in genealogy and did a lot of work on my family tree (which I used to enjoy helping with when I was young in the 70s). He also worked on a volunteer basis for the Society of Genealogists in London. We have boxes of notes that he made, including pedigrees, letters, notes on searches he had made, searches he was due to make etc. etc. Recently I started putting them on the computer and have entered most of the pedigree (including some co-laterals), but I haven't yet been through all the notes in detail.
I'm also descended from the George Aird that Wendy is descended from and have similar information to you two, although there are some significant differences. My grandfather was very punctilious and a stickler for getting the facts right and double-checking. However, he did sometimes make mistakes in jotting things down (as we all do) and I may have made typos as well as misreading his handwriting, which is not always easy for me to decipher. So, it would be interesting to confer on sources etc. to see where the errors lie. I must admit that since I haven't been through all the papers yet I'm not sure what his sources were for this information, but I can check.
I have the same date for JSA and Caroline Anderson's wedding, except that I have it in 1832, not 1831.
I have Hannah Dand's death as the 26th November 1809 and the burial on the 29th. I also have a note that she was 24 at the time of her wedding and that George was 23, which would put her birth in 1732 (or the last 3 days of 1731) and his in 1733 (or the last 3 days of 1732). This would mean that she couldn't have been 90 when she died.
Ann Spark's death was on 6th August 1816, according to what I've entered in my computer (not September), and I have a note saying that she was said to be 22 on 23rd March 1782. I also have information on her parents and grandparents. Her grandfather, by the way, was called Anthony Paxton, just like her daughter Hannah's husband, so perhaps Hannah and her husband were cousins.
I have Hannah Aird's birth as 18th Feb 1758 and her brother George's as 5th May 1759, with his burial on 15th Jan 1763.
I can let you have gedcoms of this part of my family tree if you like.
You can contact me on firstname.lastname@example.org.