There was a disscussion about the headlining starting here.
http://www.ausmini.com/forums/viewtopic.php?t=60086&postdays=0&postorder=asc&highlight=lining&start=60
I think at some stage an aussie made vinyl replaced the cream crackle but it continued to be a cream colour but more of a "grain" pattern.
In fact the sunvisors continued in the crackle pattern at least until late 68 as that is what my car has, likely they just kept importing them complete from the UK.
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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)