Totally agree with you Ubu that these Rendell/Carr reissues are fantastic - good value, superb music and fine remastered sound quality.
The one session that seems to get 'dissed' quite a bit (usually because Guy Warren of Ghana is on half of the tracks) is 'Change Is' and in many ways I think of this one as their finest hour, going out at a peak (although Ian Carr has expressed quite a bit of disappointment in print with this session in the 'Music Outside' book, well worth a read).
The original Lansdowne LPs are hard to find but I have a couple of them - 'Change Is' and 'Live'. Although the CDs are excellent, there's still a certain magic about the original LP sound.