I'm not saying it's a good idea to live on £15/week, and it's certainly not something that everyone is able to do, especially if you've got kids. But as a healthy 26-year-old with no dependants it's quite possible for me to feed myself for under £1/meal.
My point was just that a vegan/vegetarian diet tends to be cheaper. Poor people in developing countries can't afford to eat meat twice a day like people in the UK. You're saying that being vegan is only an option for privileged people - well no, it's not quite that simple.
I'm not saying it's a good idea to live on £15/week, and it's certainly not something that everyone is able to do, especially if you've got kids. But as a healthy 26-year-old with no dependants it's quite possible for me to feed myself for under £1/meal.