I went to see U2 there on Friday and made sure I scoffed a load of butties for tea before I went in there. However we still had small bags with a few biscuits and crisps etc that they seemed to overlook or not bother looking for. Whatever was left in my drink bottle they just poured into a plastic cup for me- not sure if it would be different for a sporting event.
The food is utter overpriced crap in there. My husband rushed from work and had a measly hot dog (if you can call it that- some plain bread and the sausage- no onions and I had to barter to get some mustard and sauce sachets) for £4! £6 with a drink (known as 'the meal deal') Didnt fill the gap and the rest of the menu just seemed to be bloody nachos with topping (didnt even bother to check how much they would rip you off with that rubbish). Didnt notice any draft beer, but carlsberg for £4 a bottle (poured into a cup) seemed to be all that was being served!
My advice, as soon as you get off the train, nip round the corner and there are loads of little takeaways and newsagents where you can get much cheaper food and cold beers (there's also a pub- but london prices!). Bring it over to outside the stadium, have a boozy picnic and take in the atmosphere before going in.
See you there!

No doubt...

Luckily for me I am on a diet, so won't be stuffing myself full of burgers and hot dogs etc.