"I've Been Loving You" was not originally included on any album and the single was withdrawn shortly after its release.
Neither side appeared on any official album release until the 1992 Rare Masters box set (which featured previously unreleased stereo mixes of both).
[1] An even rarer 4-song EP, released only in Portugal, contained two additional songs: "Thank You for All Your Loving" (written by John and then bandmate Caleb Quaye) and "Angel Tree" (the first true release of a John/Taupin composition).
According to John's YouTube channel, the single's B-side, "Here's to the Next Time", was recorded at DJM studios in late 1967.
[2] In 1976, Canadian band Wednesday covered the song under the title "Loving You Baby".