Sounds like a partnership between Chrysalis and Ten Years After frontman Alvin Lee. I've seen both Chrysalis Music and Chrys-A-Lee Music credited in the promos for their US Columbia promo single for "I'd Love To Change The World."
I once timed the live version on the B-side of this single, it was just over 7 minutes. Therefore it is possible that the version you mention on the "Ten Years After Live At The Fillmore East" 2CD set is a different live performance. I don't know where the live version on this single was recorded, or the actual date of the performance.
b-side (over-printed label seems to say "33 RPM" underneath - over-printing may've been for emphasis) matrix no. is not as specified on the label (XDR.47312), but XZDR-47312-T1-1L
a-side matrix matches that on its (again, speed over-printed, 45 RPM over-printed 45 RPM ) label (XDR.46693), and XDR-46693-T1-2C