I'm going to reply twice - this one to help you connect with the Islay list.
Sue
This is the direct link to the Islay list sign on page
http://lists.rootsweb.ancestry.com/index/intl/SCT/SCT-ISLAY.htmlIt's a good idea to bookmark this page as a favourite (look up at the top of your page and you should see File Edit View History Bookmarks Tools Help- just click on bookmark)
At that point you clink on "subscribe". It used to be an exceptionally busy list and some folks chose the Digest format to receive their messages (multiple messages in 1 email) but I find it easier to choose the messages that interest me by getting each message individually from the list.
Once you subscribe to the list (which sends an email to the administrator), a sign on email will be sent to you - keep it.
While you are on the subscribing page, look down below to the Search and Browse options. I often search past messages to look for clues or other people researching the same family.
After you receive your email, you can post to the list. The confirmation email will give you instructions on how. A big clue to getting good results from your query is to make your subject line a good one. In your case, may I suggest "John McKECHNIE b c1824 son of Angus McKECHNIE and Agnes McLEAN" then just put the same message you have used in you last query.