The Excel is a massive place, but only needs to be visited when at an event really, so I have visited a few times but rarely actually settled down in the communal areas until recently for long enough to actually enjoy a drink.
There are a few different places to get food and drink from, including Costa (their coffee is still horrible as I was semi-forced to visit one a week ago) so I went for E16. I had a latte and chocolate brownie which ran to £5.00 – good deal that. And I accept I said I’d avoid brownies but food options were a little limited at the time I visited. There are a couple of the stands in the communal areas and the food does differ between them but this was the closest to where I was.
The coffee was very nice, I added sugar just to take the edge off. The brownie was very nice, had a very slight bitterness to it which I liked.
I will quite happily go there again when at the next event.