The staggered drop off stuff will be the stuff of nightmares too.
Our 4 reception bubbles are spread out over the course of an hour in the morning and an hour in the afternoon.
Imagine having one child at 8.40 and another at 9.40. And then having to do the same again at home time!
How on earth are parents who are trying to work going to do that.
Also in terms of after school care, is that even possible? Most kids go to the next door nursey afterschool for us - but its mixed year groups. Unless the staff from the nursey come over to the school then they can't do it, and they don't have the staff to do it. That means no afterschool care. And can the staff from the nursery who have been in bubbles with the nursery children even do that anyway?
It sounds like a total nightmare in terms of logistics.
I can not see how it will work nor how it will mitigate the spread anyway!