According to Sean MacNamara, fiddle player with the LCB, it was they who first introduced the hey ho into the Dingle Regatta and the Kilfenora. I don't have either of their records, Off to Dublin and Champions Twice (made mid-late 1960s), but I am fairly certain the tunes are on there, hey ho and all.

In any event, back in the band's heyday, late fifties to perhaps mid 1980s, it was regarded very much as a trademark of theirs.