I think he uses tunes based on classical themes in a couple of other songs. The one that immediately springs to mind is 'Dreams of You' which sounds as if its based on 'Jesu Bleibet Meine Freude'.
We got fed up of certain types of audience asking if we would do 'Streets' and 'Wild Rover' that we perform the words of the latter to the tune of the former (with a bit of 'No Woman No Cry' in the chorus)!