Yep, I know this is rather late, but no-one else seems to have noticed! The children's choir signed as well as sang (and some only did one or the other, which suggests genuine inclusion). The NHS/GOSH dc jumping up and down on the beds were a happy, motley crew, some with visible SN. And there were wheelchair using dc in evidence here and there.
What I liked was the 'normality' of it. Here's a bunch of our lovely dc, representing our country (and some do have SN, but we're neither hiding nor patronising them)