Flower of Scotland gets requested frequently in our session in Kelso, not by the folk club, but by visitors - English as often as not. Same goes for Dougie Maclean's 'Caledonia'. One reason locals request FoS and Caledonia is because both are on the curriculum for informal music teaching in Scottish schools (at least in our Borders region) along with a few other standards, Mairi's Wedding etc. Most are either pants or kid's songs, but FoS and Caledonia are liked enough for almost all adults to know them, and request them. We usually turn it round by suggesting that the requester sings it themselves and we'll provide the music.