MS rules the government world
Open Document will never take off in UK government as it has too many connections to MS.
I work for a local government service that is pretty strapped for cash and spending loads of dosh on MS office licences drains the budget pretty quickly. I had the temerity once to suggest that we could save a fair bit of cash if we just used Open Office. Sure it's not as powerful as MS Office and given the choice, I would rather use MS Office, but it would do what we needed, had a built in pdf writer, and it would save us a few thousand per year. IT were horrified that I'd suggested such a thing and quickly went back to MS, with whom they had a partnership arrangement!! (I think I was lucky not to be stoned to death for blasphemy.)
Too many local authorities have partnership arrangements with MS. Not much is gonna change there.