These questions probably don’t bear on conformance but might indicate a need for slightly more pointed submission questions in the future.
1: There presumably is a 1.0 of this license. Is it still on the web? This one’s URL (lacking indication of version) does not give me confidence that it will continue to be available. Given that people will be relying on licenses for the nearly unlimited duration of copyright, it’s especially important for licenses to have cool URIs.
2-5: I’d like to ask explicitly why an existing license can’t be used. Or why an existing license can’t be generalized to this use with a new version? Can we expect 4 different parliamentary licenses?
6: Question not fully answered. The answer is surely by alignment. But “Aligned with” in the license is ambiguous. Alignment happens due to terms of licenses matching. If an explicit statement is to be made in the license, the UK OGL 3.0 is much better, explicitly stating compatibility and its meaning.