Of the numerous British blues-rock bands to spring up in the late '60s, the Aynsley Dunbar Retaliation was one of the better known, though solid reception on tours did not translate into heavy record sales. Musically, the group recalled John Mayall's Bluesbreakers during the 1966-1967 era that had produced that group's A Hard Road album, though with a somewhat more downbeat tone. The similarities were hardly coincidental, as the band's founder and leader, drummer Aynsley Dunbar, had been in the Bluesbreakers lineup that recorded the A Hard Road LP. Too, bassist Alex Dmochowski would go on to play with Mayall in the 1970s, and guitarist Jon Morshead was friendly with fellow axeman Peter Green (also in the Bluesbreakers' A Hard Road lineup), whom he had replaced in Shotgun Express.
The Aynsley Dunbar Retaliation's third and fourth (and final pair of) albums, To Mum, from Aynsley and the Boys and Remains to Be Heard, are combined into this two-CD reissue, which adds lengthy historical liner notes by British blues-rock expert Harry Shapiro. Although Remains to Be Heard would be cobbled together from outtakes and recordings done without Dunbar, their third LP, To Mum, from Aynsley and the Boys, was truly the final proper full-length release by the original group. Dunbar had expressed some interest in moving further afield from the blues-rock format around the time the record was done, and the addition of keyboardist Tommy Eyre (from the Grease Band) to the lineup was one step in that direction.