No because they do have a limit on large group sizes, they have done for years. I imagine it's because they want to do stuff as a group, that can become a problem.
And I say that as a mum of two SN kids.
To be honest I don't know why it's so popular with SN people, the staff weren't particularly nice towards them, when we went this year not one redcoat spoke to any of the SN kids in our group of three, at one point my son grabbed the arm of one to get his attention and he was blanked because the guy couldn't understand what he was saying.
And THEN there was a security guard who leapt on my boy because he'd ran into a private area, bearing in mind he's autistic and doesn't like being touched it didn't go down too well and I had to deal with the fallout.
Personally I can't stand the place, can see why the kids do tho so we go every few years, because i'm a kind and giving parent
The care home should have kept quiet and booked seperately under different names anyways !