Originally announced as a Blu-ray release for the UK, this was abaondoned as the picture elements made available were not seemingly good enough claimed the company, and it reverted to a PAL DVD. We were also promised an english language track, but this too was abandoned and does not appear on the final specifications of the released DVD.
What went wrong? I would suggest making a 4K scan of the original Techniscope negative, finding the best available english language from an optical print (or master tape if at all available) and filling any audio gaps with a carefully extracted and not overly filtered/cleaned-up english language from the old UK VHS Techno Film (Fletcher) which I am told contains a longer version of the film than the print aired by the BBC and the old Aktiv label VHS.
So the best version currently on sale (12 October 2012) is the recent German Explosive Media (Alive) release at:
(copy and paste into your browser)
(which is not currently listed on the UK site)
as it has the anamorphic print, a choice of English/German/Italian languages (although the english is NOT complete and subtitles are used over some scenes in Italian).
There is a French DVD which has a similar print quality offering a particularly clear French audio track and Italian audio should that be of any interest too.