Derek Bailey, guitar; Evan Parker, soprano and tenor saxophones.
The London concert part 1 (14:50), The London Concert part 2 (3:58), The London Concert part 3 (11:52), The London Concert part 4 (6:57).
Recorded in London by Martin Davidson on 14 February 1975.
Re-issued in 2005 on CD, with previously unissued music, on psi 05.01.
Also released in Japan by Victor Musical Industries as VIP 6658.