I am searching for details on the McConnachy family on the Kintyre Peninsula. The furtherest back that I have gone is the 1841 census (see below) where I believe my GGGG grandfather was Duncan McConnachy and his wife was Catherin McTavish. I determined Cathrine's surname was McTavish from IGI which has the marriage date as being 18 June 1803 in Saddell.
I wondered if anyone with access to the book called the List of Inhabitants upon Duke of Argyle's Property in 1792 could find out anymore details about both Duncan McConnachy (born c.1775) and Catherin McTavish (born c.1779)?

I also wondered if anyone can explain to me how the IGI website works - eg how I can understand the source information for Duncan and Catherin's marriage details which simply says -
Source Information:
Batch No.: Dates: Source Call No.: Type: Printout Call No.: Type:
M115312 1798 - 1821 1041076 Film 6900468 Film
Sheet: 00
How do I check this source?

Many thanks in anticipation.
McConnachy
............................................................
Reference to 1841 census for Saddell.
Piece: SCT1841/531 Place: Saddell & Skipness -Argyllshire Enumeration District: 4
Civil Parish: Saddell Ecclesiastical Parish, Village or Island:
Folio: 4 Page: 9
Address: Grogport
Surname First name(s) Sex Age Occupation Where Born Remarks
MCCONNACHY Duncan M 66 Agricultural Labourer Argyllshire
MCCONNACHY Cathrine F 62 Argyllshire
MCCONNACHY John M 35 Argyllshire
MCCONNACHY Duncan M 29 Argyllshire
MCCONNACHY Ann F 25 Argyllshire
MCCONNACHY Hugh M 20 Argyllshire
MCCONNACHY Archd. M 18 Argyllshire