Let's remember we have not been on lockdown for even a full month yet.
The whole point is to stretch out the time it takes for everyone to catch the virus and maximise survival of the almost 8 million who will need help when they do.
I think it's important to workout the figures.
I'm not a statistician but I think they are:
UK population: 65 million
80% catch the virus: 52,000,000
14% of which will need medical help if they catch Covid-19: 7,280,000
6% of which need intensive care: 436,800
The UK has 8,000 ventilators (436,800 /8000=54.6)
Average time needed on a ventilator=21 days
It will take 3 years to achieve herd immunity unless we do not ventilate people who need care. (21x54.6=1,146 days=3+years)
60% of those ventilated patients do not survive: 262,080
percentages quoted in www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30243-7/fulltext