per adult human...and no takeaways.
I reckon you could eat pretty well for twenty quid for the week.
pack of mince for chilli/spag bol - £3
medium free range chicken - £5-£6
12 eggs - £1.50
fruit n veg - £5
other stuff - whatever is left from the original twenty quid
this is assuming that you're already stocked up with shit like onions, rice, pasta, herbs n shit
reckon you'd eat pretty well, actually. that chicken will do four meals, for example