Did a walk past there today and decided to take the lift up to the 8th floor where it's supposed to be as I'd never been up there before. I got out at the top and there was a corridor with a glass wall with a so so view to the south. I just assumed that was it because to the left and right it just said "restaurant". But I've looked at pictures online and it seems you're supposed to be able to see the river from the viewing gallery! So how do I get to it?