I've only flipped though it, but this stood out to me:
Place closures suppress the first wave, but when the interventions are lifted, there is still a large population of people who are susceptible and a substantial number of people who are infected. This then leads to a second wave of infections that can result in more deaths, but at a later time.
So if I understand that right, they're saying that if we'd stayed open they think we'd only have had one wave which would have killed fewer people.
Having suppressed the first wave, then a second wave was inevitable and then in total more people would die.
This seems to be making two assumptions.
Firstly that if we'd let the first wave go, then herd immunity would have been achieved by the end and we wouldn't have a second wave or at least a much lighter second wave.
Well, Sweden looks like it may be heading for a second wave, maybe it will be less than the first, but there's no guarantee that will be the case. The first wave only had one day above 1500 cases, 2nd October, they had over 700. Let's wait and see on that one.
But that's also bypassing that it seems to be that immunity doesn't last. So Let's say we'd had a huge wave in March, now were going into a tiny second wave. By next March it looks like a good proportion of those initially infected could now be susceptible again so, if no vaccine is out by then, could have a good sized third wave.
Secondly it also seems to be assuming we do nothing or little about supressing the second wave.
Which would Mr Johnson be a stupid thing to to do wouldn't it?
I'm also surprised that this was done under the department of "Physics and astronomy" which seems an odd one.