Composed by Angus MacKay (Link to biography on PipeTunes.ca) http://www.pipetunes.ca/composers.asp?pg=Details&composerID=113
I am currently studying the 6 part version by Simon Fraser University Pipe Band (not sure where I got a copy, but does not seem to be freely available, so I will not post). Another 6 part version is available for purchase thru pipetunes.ca, but this requires membership. I find this source to be personally worth the expenditure and the download fees are peanuts. Pipetunes resources are also copyright protected.
See and hear performance SFU BH Seattle 2013 Balmoral Highlanders, Bogan Lochan, Pretty Marion
4 part version
Found a copy of page 27, book 1 of Ceol Sean’s Glendaruel Collection