do you have a christening date/place for William Tarbet - the only entry I can find in IGI says 1775 but quotes no day/month thus I presume this patron submitted entry is from his age at burial - Tarbet appears in several guises Tarbett Terbett Turbott etc so I could have missed one.

William Tarbat was confirmed 10 Aug 1790 (from my transcription of PR) thus I would also expect birth c. 1775 (there are no other Tarbet confirmations that I can see nor could I find any for Ellinor Cannell though the Cannell name is quite common).

I could find Ann Margaret Torbat ch 15 Feb 1782 but not William