Just to be clear, before I answer, I'm not demanding to be told *everything* *now*. Some of this is because, as I said earlier, we** can't expect the Government to know everything about this themselves. But this isn't a war with an enemy who mustn't find out what we're doing, so some of the more typical reasons for secrecy simply aren't present. Where possible and sensible, there's no reason for the Government to hide the data it's using, the modelling it's doing, or the reasons behind its major policy decisions. As diddly asked, for example, why isn't the Government recommending mask use, or why did the Government close Schools? There may be valid answers to these -- in the case of masks, opinion is divided on their efficacy in general use, and the best masks should clearly be reserved for frontline medical staff, so I happen to agree with the Government on that one -- but, valid or invalid, the Public can't be blamed for wanting to know.
Some of this will come out in the inevitable Public Enquiry.
**I just wanted to take some time to clarify that when I say "we", I mean people in general. I'm not referring to any specific group that happens to include me. When I said "we're all operating with incomplete information", then, I was implicitly including the Government and its advisers, not everybody else. It's the same "we" found in scientific papers, when "we" means "the authors, but also anybody else who happens to read this".