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that was the song they played, but realise that they did not have an actual regimental march, I'm not sure why exactly but they never did adopt a specific one

Yes, Roscoe; thanks. I'd been wanting confirmation of my own suspicion that this march is, indeed, "Scotland the Brave".

Thank You Very Much!
"Whitout music, life would be a mistake."
-Friedrich Nietzsche

the scottish march you're referring to is entitled "scotland the brave" it's usually a very popular tune with a pipe band and should be easy enough to find (along with many variations of dirty but humerous lyrics)
realise however that this was not the first special service forces regimental march. in fact, the unit never did have one, because of the 60's flick people assumed scotland the brave was their tune. it's the same way that the fssf didnt ever have a regimental motto (such as semper fidelis which the marine corps still holds today {though semper fifaithful forever})