I recommend their 1974 live double album "Sunday Night At London Roundhouse" in the expanded 2002 cd-rerelease version.
Features the complete concert. Recorded live at the Roundhouse, Chalk Farm, London on November 25, 1973 by the Pye Records Mobile Studio. Engineered by Vic Maile. All Tracks mixed from the original 16-track master tapes by Paschal Byrne, Roye Albrighton, and Mark Powell at the Audio Archiving Company, London in March 2002.
Track list:
Disc One
Crying in the Dark/King of Twilight (12:10)
Desolation Valley/Waves (8:58)
A Day in the Life of a Preacher (inc. The Birth of Oh Willy) (19:50)
Summer Breeze (3:04)
Cast Your Fate (5:42)
Disc Two
Remember the Future, Part 1 (18:47)
Odyssee (Ron's On) (11:15)
1-2-3-4 (12:31)
Remember the Future, Part 2 (Let it Grow) (5:14)
What Ya Gonna Do? (6:09)