It’s been officially released onto Blu-ray disc. The release from OP would make for an interesting second disc.

Blu-ray A America - Lions Gate Home Entertainment
Vestron Video Collector’s Series #6
Commentaries:
Audio commentary with Director Ken Russell
Audio commentary with Lisi Russell, in Conversation with Film Historian Matthew Melia
Extras:
“Worm Food: The Effects of The Lair of the White Worm” featurette (27:08)
“Cutting for Ken with Editor Peter Davies” featurette (9:32)
“Mary, Mary with Actress Sammi Davis” featurette (15:42)
Still Gallery (2:59)
Theatrical Trailer (2:11)
“Trailers from Hell” trailer featuring Producer Dan Ireland (1:45)
Subtitles:
English HoH
Aspect Ratio:
1.78:1
Picture Format:
1080p 24fps AVC MPEG-4
Soundtrack(s):
English DTS-HD Master Audio 2.0 stereo
Case type:
Keep Case