Sorry, but the issue of the COBR meetings is a complete red herring. In any emergency, unless it needs an immediate response, there is an initial planning and organisation phase. At this point it is unnecessary to directly include the boss in the planning, since he usually lacks the knowledge and expertise to contribute very much in the early stages. The people who are included need to have sufficient seniority to be able to make decisions and to direct the planning, and in the case of the pandemic this would be the Health Secretary, who did attend these meetings. Also, of course, he will have briefed the PM/Cabinet on what was happening, and will have sought any decisions he wasn't able to take for himself. It would have been a complete waste of the PM's time for him to sit through all the detailed material and briefings in those early stages. If anybody wants to understand the depth of detail, go the the Cabinet Office website and search for the SAGE Meeting minutes. You will quickly see exactly what I mean.