So it's you who's buying the food each week? That's an odd position for someone who doesn't even have enough clout to decide what they keep in their room to be in.
According to Google six pounds is at this exact moment worth $9.55. I guess according to the USDA's statistics I could "Thriftily" feed a male human between 14-18 years of age for a little over a day and a half on that much money.. Gee, that's sort of depressing, but nonetheless... that's a "whopping" sum to you? I'm sorry.
Weren't you totally working on your own floppy emulator board using some unnamed microcontroller or something? Are those free in England? They sure ain't here.