The UK and devolved governments signaled on Thursday that the plan is for the vulnerable to be self-isolating for a long period; and based on the briefings to UK jornos on twitter - it'll be 16 weeks of self isolation for over 70s and those with underlying health conditions (they've not said what conditions yet) - I've seen it referred to as 'cocooning' by some.
I think the UK was doing a really good job, and has been doing a good job with this - I do think they've really misspoken when they've talked about herd immunity and have been trying to walk the term back.
You've got to bare in mind, that they aren't doing the politically easy things here. It would be easy to close the schools. Based on people I've spoken to, its going to happen soon - but I suspect they want this to happen after the over 70s and the vulnerables are into self-isolationg, and not shouldering childcare responsibilities. None of this is easy, we can't magic this virus away.