I'm not surprised to hear that otherwise it would be difficult. I assume wines and spirits are taken off as well. Re Wembley it's well documented that the Spoons there does something similar. I don't know if it includes events at the Arena as well. If you're going to an event the answer is to find somewhere a few train stops away from the event. My parents used to live in Wembley and there has never been anywhere worth going. It's a disaster area!