The most desirable vinyl issue remains the UK version, with its die-cut fold-out sleeve and The Hawkwind Log booklet - this version was also released in North America and various European territories. However, Japan produced an interesting gatefold variant which included an insert with lyrics and sleeve notes.
In other territories, it was released in a single sleeve, with a variety of back covers.
The Spanish version is also notable for translating the song titles and including 'Silver Machine', making side 1 of the album over 27 minutes long.
Presumably to make the sides as equal as possible, the cassette version once again changed the running order. Note that the spine gives the title as X In Search Of Space.
The UK 8-track has the same running order as the cassette - but mistitles the opening track as 'You Should Do That'. And the cartridge gives the title as Xin Search Of Space.
The US version of the 8-track has a different running order from both the vinyl album and the UK cassette/8-track. Nice rendering of the title.
And here's a mystery variant, supposedly a UK issue, but with the US running order.