Nicky, in my council the "hub" schools within each district are providing childcare for essential workers who have been unable to secure other childcare, to enable them to work.
It is probably the most expensive childcare in the world.
All teachers taking part are volunteering to do this, at risk to their own health if they are infected by a visiting child. All teachers are also providing home education and support to their pupils daily.
I am a support assistant who has also volunteered to help and we all work on a rota system, including holiday periods, until further notice.
The children attending my hub school are from 6 schools, ranging from 3 yrs old to secondary age.
We encourage children to bring work with them to do from home, or they may be able to use a computer to access their own personal teacher's online teaching (if one is available).
We have no idea how many children (ages/stages/needs) will arrive each day, nor for how long. We have a minimum staff allocation each day, with teachers on call to attend if numbers increase.
If parents can make other arrangements for care of their children while they work, that is the best outcome. However, if that cannot happen then schools aim to provide a safe, secure, hygienic place for children to stay while parents are working.
Just because the childcare is in an education setting, do not assume that formal teaching will take place. It is just a childcare service.
Hope this clarifies things for you.