Only the first title should be converted to from sort to display order. Subtitles don't influence display order, so don't need to be touched. OK, I now have a subtitle with a comma ('Ring the Bell, Watchman'). If it was the main title I'd have to do something else, but it isn't, so for now...

X: 1
T: Shooting
T: Beaux of London City
A: Adderbury
M: 9/8
L: 1/8
Q: 160
P: (A2.B3)6
K: G
P: A
D | "G" G2 G BAG B<dD | GDG B2 "D" A A2 D |\
    "G" G2 G BAG B<dD | GDG B2 "D" A "G" G3 ||
P: B
"G" d2 c B>AG B/d-d | "D" A2 A A2 "G" B "D" c3 |\
"G" d2 c B>AG B/ d2 | GDG B2 "D" A "G" G3 |]