I finally got a chance, in the daytime, to take a good look around the whole thing.
I have to say, it's rather disappointing. The impression I got (a decade or so ago), was that the retail would be more mixed. All we've got is restaurants a massive food court, with very few exceptions.
The one place of interest to me is that Japanese(?) shop. But I was very unimpressed that they don't take cash for even a $5 purchase (WTAF?). So I'll avoid them on principle - though the the sushi triangles are excellent and fresh!
I know know that the answer to my previous query of where to find milk at 11 pm is the one little newsagent (or whatever we call them now they don't have news) on the main floor in the York Concourse. Only in 500 mL boxes, but that's enough for a cup of tea in the morning; and some cereal if you get a couple.
It's amazing that there was such a latent demand for food there.