Well for a starters people that live in the country? Surely they would like to know what the government is doing with their literal lives of themselves (if men) and of their families. The BBC casually throws in the remark that the figure may have jumped from 17k to 70k on the back of a failed counter attack.
Again I'm not talking about real time information, but overall transparency is surely expected to a point if people will give their lives potentially to the government?
Some files from WW2 including Himmlers death, Hess visit to the UK including the correspondance with the King, Churchills knowledge of Pearl Harbour, pretty much everything SOE related, sinking of the RMS Lancastria, and a lot of the freindly fire incidents. Thats just from WW2