There are other types of childcare available
Have you tried finding childcare with no warning, that is free (or low priced especially if on low income) and readily available for every day you need it?
At present many ASC have no spaces or haven't been able to reopen. Most have restricted numbers currently.
At my school the ASC was run by an external agency and can't restart in our school due to restrictions within our building. Their new location is fine but they have restricted numbers, lower than previously.
Childminders are already hard to find for AS care in many areas. They are currently much trickier to find spare places at and have long waiting lists.
My sister would have no choice but to not work if my parents couldn't look after my nephew. She tried his school but it has a huge waiting list already. All the local childminders have no space. There is no nurseries etc that take year 3s that have spaces for after school care near school. They don't earn enough to employ a nanny. They were also given two days warning that it was coming into place. Of course they, and most working parents in a similar situation, ignored the rules as they had no choice.
Hence the government's u turn on this.
And do remember that not all grandparents are 80+ year old and previously shielded. My parents are under 70 and healthy and weren't even classes as vulnerable, let alone extremely vulnerable and shielded.