Hi Lesley. I was pleased to see your post as it encouraged me to follow Dollin Garret down for a while, which I hadn't got round to doing before.
Just a couple of queries on your outline, though:
Thomas Corjeage- Charlotte Mylicarane - how do they fit in? Married in May 1813.
Can you tell me where you found the birth/baptism year for Patrick Corjeage, husband of Mabel Shimmin? I hadn't been able to spot it in the Kirk Michael register.
Joney Garrett 1763- Thomas Corkill 1760 - Have you seen this marriage in the register? The IGI (member submission) has 'Jane or Joney' but in her transcription on Manx Notebook Frances just has Jane. Do you happen to have a baptism for a Jane d/o Dollin Garret & Quirk (IGI didn't turn up anything useful in Kirk Michael)
Catherine Corkill 1809-William Cowley1808 - I couldn’t see a baptism for Catherine in 1809. If she was married in 1826 (as per your post, 27 May 2009, at 7:15 p.m.) she would only be 17 so you'd would expect permission to be mentioned for her as it was for William.