Ignore this, it's just a repeat of the tune above. I copied it, including the spaces before the lines of code, into my copy of ABCExplorer, where it duly appeared perfectly and without the offending spaces, and I have copied it back to here to see if the spaces reappear. So...

X:850
T:Princess Beatrice
R:Hornpipe
O:Scotland
M:4/4
C:W. B. Laybourn
Z:Richard Robinson
%%RR_OriginalCollection:
%%ID:00000aef
K:Gm
dc|BDGB AD^FA|GDGB dcBA|Bdgf   edcB |AGFE DcBA   |
BDGB AD^FA|GDGB dcBA|f=e_ec AD^FA|GBdg G2    :|
FE|DBEB FBEB |DFBd fbfd|Ec=Ec FcGc |Acec AFEC   |
DBEB FBEB |DFBd fbfd|f=e_ed cBAG |FEDC [B,2D2]:|