Hi
I am glad to help, I got the records from FindMyPast. I only searched on David Walker and his approx birth +/- 5 years into the search on their section "England & Wales, Crime, Prisons & Punishment, 1770-1935". Then I examined all the records that came up that either did not have a birth date or were within a few years.
These originated with National Archives I think, as follows:
1. Reference: PCOM2: Millbank Prison, Middlesex: register of prisoners, Piece number: 32, Page number: 139.
2. HO24, Source: Home Office: Pentonville Prison Registers; Piece No. 116; page number
others: HO8, Dartmoor quarter returns, Piece numbers: 113, 114, 117, 118, 119, 120.
3. Piece 119: No 26 of Prison Book: First name(s): David, Last name: Walker, Age: 33, Birth year: 1818, Year: 1851, Date: 08 Apr 1851, Prisoner number: 1417, Court: Northallerton, Crime: Stealing a pair of trousers & a sheet & pre. con., Sentence duration: 7, Surgeon’s Report, Behaviour during the quarter, Number of Preceding Musters are all blank; Remarks: died 24th February 1854, This was the quarterly return 31st March 1854 of Dartmoor Prison.
Plus there were 2 from Ancestry, one in relation to his imprisonment in 1850 for one month for larceny, and one referring to his trial in April 1851. I was also able to find him in the 1851 census which was taken on 30th March 1851. His wife Isabella at this stage was in Ellingstring, and is described as an ag.lab., indeed that is what she was described as in 1841 census too when she was also in Ellingstring.
Re Mary Stott's marriage to David Walker (father of David we are discussing) - I understand they married in Masham?
I would love some further info re the Stotts. All I know is that James Stott married Elizabeth, but not who she was or where they married. I know they had an older son, Thomas, and younger son James, and daughter Susanna. One of the witnesses for Mary Stott's marriage to William Vayro was Susannah Stott, presumably her sister. I also think that James Stott was still alive in 1841, living in Masham, and described as a stonemason, aged 65. Does that fit with your information?
I am not sure how to send/receive private messages.