I have been saying that this is the obvious solution.
Many 'shielders' (myself included) should lock themselves down .
The current situation is never going to work. But there is no way to get the economy running, the health service not overwhelmed through winter AND kids at school. We really can't have it ALL ways without sacrificing one of those.
The best solution is to protect the vulnerable. We need to do this to ourselves. If like me, we continue to work from home. (I will be anyway regardless of government decisions) Many shielded we're in the same position do they don't need to be supported. For those who can't WFH they need to be furloughed until the R is way down. Probably until next spring. Meanwhile everyone else not at risk can get back to normal.
The only issue then , that needs to be worked out is how to educate those shielders who have school aged children. So some tough choices to save your life. Perhaps Covid shielders schools . Where the kids are in much smaller bubbles and therefore more distanced or a proper online 'school' set up by department of education. With laptops and internet provided . Much less hassle the the whole countries kids at home. In the thousands rather than the millions as most shielders (I think it was around 4 million) are older and don't have kids.
The shielding list MUST be only those officially designated as such by the NHS. No 'self diagnosing' . Those at most likelihood of dying or suffering long term consequences.
Once we are all locked away again, people can really get on with life and get the economy going again to help pay for this relatively small proportion of those that need protection.
At the moment we have the expectation of the curtailment of life for the masses to protect the few. It needs to change to the protection of the few by the economic assistance of the masses.