the other great advantage of the english concertina is the relative ease of playing octaves ,this of couse can be done and is done by noel hill on the anglo but can involve awkward fingering and difficult cross rowing, and there does seem to be fewer notes [although it is a sound many associate with the anglo ]its done on the anglo than the english. in other words the english has greater scope for producing this sound associated with    anglo concertina irish music, than the anglo.