I think and please remember I'm a moron with an over active brain that has went in at the deep end here but when they originally mentioned Herd Immunity they backtracked quickly after people worked out it would cause so many deaths then it was damage control from them, even just last week Hancock was questioned on it and he said it was never mentioned, despite the BBC having a clip of the science fud Valance mentioning it. Some did say that even after they rejigged their strategy they were simply just dressing it up another way, it's now clear as day that they want everyone to get it despite them telling us to stay in and stick to social distancing, thing is there's no definitive proof that you can gain immunity from this virus, that from what I've read, I realise rocket/his daughter are better placed to comment but from what I've read it's just a gamble.