Thanks all, I look forward to the LibreOffice port in due course.
Minor incompatibilities between ODF and legacy MS Office formats mean that converting to and fro is a pain - things like maths equations or footnote styling. Having firmly made the move to ODF some time ago, I now have far too many files to ever go back.
At present I can at least convert specific files to legacy Office formats for working on-the-go, that will have to do for the time being. FYI I use Kingston Office on my Nexus, being an Android app - and free at that - it is somewhat cut-down, but even so I am very impressed with it.
The eternal help vampire