I was able to do it 1 by 1. I started with 1 person. Got them a slot. Then did a copy. It would not give me the same exact slot, it gave me 5 minutes later. Repeat. I ended up with 7 passes that were staggered by 5 min. (my kids were each in slots by themselves) It was fine.
Then a few days later, they opened it up from a limit of 1 to approx. a limit of 4. I could take my 1-offs and copy them to another, getting up to 4 in any given slot. I was tinkering w moving them here and there, but I could not get them to over 4 at one time. So now I'm booked in two groups (3 and 4), 5 min apart. I'm good w that and see no reason to tinker further.
I think what's happening is each A&E slot has a capacity of 4. When there are 2 in that slot, you can only get 2, and so on. By booking 1 and then copying 1 by 1, it picks the "nearest available" and puts them in that slot.
Sometimes you'll be able to find groupings of 4.
If you try 5 or more, you'll never find anything because there is no single slot of 5.
Trying 4 or less you may find some, but your best bet is to do them 1 by 1.
Hope that helps!!
Apr 24-25 tho, you're within 30 days. Pretty much everyone has had a chance by now. I would go down to 1 by 1 and hope you find some one-offs.