DontCallMeYourMajesty's friend reporting for duty :) And yes, I have a sneaky feeling that DD2's additional year will have made her a little more stroppy and a little more stubborn. The joy!
As DCMYM said, I didn't think the food prices were that expensive, although it does help that I only had to buy for myself and 2 quite small children. We took breakfast and a LOT of snacks, plus carried water bottles that we refilled from the numerous taps around the site. Whenever one of the kids started to whine about being hungry we'd whip out a cereal bar or a packet of Cheddars and they'd be placated :) We bought all but 1 lunch out, I think, and all our dinners, and a few treats of the icecream/strawberries and cream/cupcake variety. I took £200 and came home with a little change, having also bought tat souveniers for the girls from that. The food was a big part of the experience for us though, I think - I do love my food (sadly it shows!) :) I'm really looking forward to my burrito and curry already, and I believe Hummingbird Bakery will be there this year :o
I will say though that the whole 'queue for hours to get on site, walk half a mile plus to the trolley place, drag trolley half a mile back, load trolley, attempt to find relatively flat space to camp, drag trolley back up hill to carpark, re load trolley, all while DD2 is whining for the toilet but refusing to use portable potty (understandable)' etc experience was one of the worst of my entire life. And I have had some pretty grim experiences ;) I HOPE we'll make it a little better this time by taking a trolley (yay DCMYM's dad!), arriving much much earlier, and having a better plan re campsites and car parks, now we know a bit more of what to expect. I guess the experience must have made up for the set up part or we wouldn't be going back.. 
At least we didn't have any of the trouble with the drugged up teenagers that many reported last year, and it sounds like they're clamping down massively on that this year anyway.