just to add to the information. Dick Gaughan did not write both sides the tweed, he changed two or three words of the text which is printed in my version of Hogg's jacobite Relics (1819) along with the original tune. There is most definately a hyphen between spring and breathing in this version. This version of Hogg's has the chorus:

Let the love of our King's sacred right
To the love of our people succeed.
Let friendship and honour unite
And flourish on both sides the Tweed

Hope this is helpful

Moira