This announcement seems to have slipped under the radar a bit, but (assuming I'm reading it correctly) it's potentially very good news: http://www.nationalarchives.gov.uk/news/498.htm
I'm no expert but it looks basically like a CC-BY license, with a few additions to explicitly spell out moral rights. They're claiming it's interoperable with CC, but I haven't seen anything from Creative Commons themselves on the issue yet.
Here's more about where it will be applied: http://www.nationalarchives.gov.uk/information-management/government-licensi... So it seems like it will apply at least to things previously under Crown copyright and Crown database right by HMSO, with a few exceptions. The exclusion for the other delegated bodies (last bullet) is a major limit, but we can hope that they will follow HMSO's lead.
Pete / the wub