I gave a full derivation of my tune some years ago on mudcat. As a piper I was aware of Colonel Robertson and also Burns's song Sweetest May. The latter's tune is Kinloch of Kinloch which I found in Johnson's Musical Museum and predates Blow the Wind Southerly which copied the first part of Kinloch. I reduced Col. Robertson to 3/4 and changed a few bars to suit my words and MCPS and the PRS then credited me with composing a new tune ... all this info was made freely to the aforementioned bodies and Mudcat, as I said, many years ago.