Sunday Night at the London Roundhouse was the first live album by the English progressive rock band Nektar.

[1] Side 2 was recorded at a live-in-studio jam on March 27, 1974, between the hours of 2:00 am and 5:00 am, at Chipping Norton Studios in Oxfordshire, England.

An expanded recording of the jam session was later released as a separate CD under the title Unidentified Flying Abstract - Live at Chipping Norton 1974.

All the tracks were 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.

The Chipping Norton Studios 1974 material (side two) was removed, but included on Unidentified Flying Abstract, also released in 2002.