The single version of "Island" (a different recording from the album version, with faster tempo, more overdubbed backing vocals, and no classical themes at the end) was backed with a non-LP B-side, "The Sea." Some CD editions of the album include both of these tracks.
Renaissance was initially released in the UK in 1969 by Island records as catalogue ILPS-9114; it was also released in America on Elektra and by Island in Germany) as 87 609 ET.
In 1998 Renaissance was reissued by Mooncrest Records (U.K.) as Innocence. This reissue included six bonus tracks, but the packaging included no explanation of what they were. Besides "Island" (single version) and "The Sea" (see above), there were the following:
"Shining Where The Sun Has Been": Pre-Renaissance demo (1968) recorded by Keith & Jim under the name "Together."
"Prayer For Light" & "Walking Away": Tracks recorded, post-Renaissance, by Keith & Jim (written & sung by Jim) for the unreleased 1971 film Schizom.
"All The Fallen Angels": Demo, 1976. Keith's final recorded performance.
On 29 November 2010, Esoteric Recordings released a remastered and expanded edition (including both sides of the band’s first single).