I managed to get the LP a few years ago after looking for it for a long time. Missa Super L'Homme Armé is wonderful piece and it's well due for a CD-issue. There's been lots of recordings of the later pieces in recent years, but hopefully this is the start of the re-issues of the early pieces? Pieces like Antichrist are like nothing before or since. Can we also have a recording of 'Tavener' too - maybe the one that Oli Knussens did for Radio 3 a few years ago?
Buy it - your ears will love you forever!