Geraldine Gallagher played whistle on ABA. Here is the line-up for the album:
Shane MacGowan's Popes: Shane MacGowan (vocals); Paul McGuinness (guitar); Tom McMannamon (banjo); Mick O'Connell (accordion); Bob Dowling (bass); Andy Ireland (drums).
Additional personnel: Theresa MacGowan (vocals); Geraldine Gallagher (whistles, Uilleann pipes); Sarge O'Hara (piano).
And, of course, also Siobhan MacGowan, on backing vocals.

Brian Kelly joined the band later, in the end of 2003.