Just for reference, this was never actually said by anyone in government, though it's bizarrely been attributed to just about everyone relevant in it.
Aside from what I've already noted about what herd immunity is and isn't (it is having enough people vaccinated so that those who are not or cannot be vaccinated, or are immunocompromised, do not risk exposure day to day; it is not having enough people infected and recovered that the general population is not at risk of exposure after the immunocompromised have died from it), it also wasn't what the initial response was.
The initial response was containment - detecting existing cases and attempting to contain them by sequestering those infected and those with whom they have had contact. That moved to delay - containment has failed (some cases were not detected and could not be contained, others may have breached containment by not covering all of their contacts), and the virus is in the wider population, but we attempt to delay its spread by reducing movement (cancelling large gatherings like football matches for example, which we did at the start of March), in order to limit the impact it can have on health services with a smaller but longer spike in cases.
Neither was the government "doing very little", but a carrying out a planned, staged response according to the best scientific advice at the time - which you can see here:
https://www.gov.uk/government/group...mergencies-sage-coronavirus-covid-19-response
What we've seen over the last week is an increase in the measures taken for the delay phase, initially as advice and then - because the advice was ignored - enforcement.
It's all here:
https://www.gov.uk/government/publi...-a-guide-to-what-you-can-expect-across-the-uk
And "herd immunity" isn't anywhere in that document.
It is my belief that herd immunity was mentioned in that first Thursday press conference by the Chief Scientific Advisor, on the left of Mr Johnson (right of picture). He may have only made a passing reference in explaining an answer to a question, in which case I stand corrected. But that's where it was picked up from, personally. I haven't seen the Thursday conference again to check the context though. That's not to say it was stated policy and I accept that to be the case from your useful links, thanks for those.
The "impression" came out from that conference to many people that they were too relaxed. Especially given the situation in Italy at the time. However, its nigh on impossible to get the right tone in something like that.
That was the conference where they mentioned that we were 4 weeks behind Italy.
Also, to be fair, the football matches were cancelled largely because Mikel Arteta tested positive along with Hudson Odoi on that very Thursday. Which meant that the entire Arsenal and Chelsea teams and squads were in isolation for 2 weeks and forced the hand of the Premier League and then the rest of the League as more were expected to be imminently (Portsmouth have had a number of cases this week I understand). I think it's fair to point out this was not related to government policy, but was in fact ahead of any official announcement.
Having said that, we are where we are now, and I don't believe it really matters now how we got here, more how we get out of this.
There's a lot of hindsight to watch out for, but other evidence that government policy is being at least "pushed" by others. We were threatened by France government on Friday that they were going to close the border because we were not doing enough (widely reported).
I'm going to end though by saying the people responsible for much of the current position is the selfish irresponsible idiots who continue to congregate and frankly don't give a **** about anyone else.
EDIT
@Joey D That's fine and I understand your point of view. What you're saying I think is you believe we should accept higher deaths from Covid because the alternative would be worse due to impact of actions and deaths from other causes (hardship etc). I disagree personally that the alternative would be worse, but then I dont have access to the knowledge to "prove" this either way.
I guess governments will be weighing this up all the time, and there will probably be studies trying to predict the different possible outcomes. The figures I have mentioned previously come from 2 University College of London studies by the way.
I do think there will be a second wave, or even a third, before any vaccine or cure. And there may be a time when we have to take the lesser of two evils and not lockdown a new wave.
I REALLY don't envy the people having to make all these decisions. No-one has been in that position in most of Europe since the war. And I am grateful for that.
EDIT
@Danoff thanks for the explanation/clarification. Those numbers were based on a scientific study based on a certain set of measures in place in the UK at the time. They said on top of the target of 20,000 deaths, there would be an additional 35,000 to 70,000 deaths in the UK under those measures. I have, to be fair, taken the higher end of that study forecast and rounded up from 90,000 to 100,000.
Those measures in the forecast were excluding any lockdown in the UK.
I hadn't taken into account the affect of the lockdown already on that forecast as they haven't updated it yet I believe. It's fair to say even a 4 or 5 week lockdown on it's own will reduce those figures by some amount 👍
I think though that the date suggested is too early and inflexible because it doesn't really take account of the position of health services in those countries. Italy has been in lockdown for more than 3 weeks now and one of the best health systems in the world is still overwhelmed and their cases and deaths still increase by around 10% every day. And Spain is rapidly joining it ( and the UK probably will and others unless we're fortunate). Not helped by the fact that staffing is hit by 10-15% of cases being health workers.
If your health services are still overwhelmed on the date you have set to start reducing measures, what do you do then?
Final comment - it's refreshing to discuss things here as this forum is much more restrained generally and open to serious discussion than most places right now