Ebay have a DVD-R of the film for £5. I just ordered mine (they have more left). No idea what quality of the recording will be like but I'll report back, also on the film itself which seems interesting.
I think I have a blind spot on Lindsay Anderson as I never really liked If, This Sporting Life, O Lucky Man or Britannia Hospital (a bit like saying I don't like The Devils, The Music Lovers, Tommy, Mahler). But maybe I need to revisit.