I disagree with that curlew.
Life is complicated and it takes more than a basic standard of living and enough money to scrape by to create advantage. There are so many other things that can affect family life, having just about enough money isn't enough of an advantage for it to be right to positively discriminate against a child in that position.
FSM is just too blunt a tool to use for something as fundamental as education, especially if it is going to give a child that receives them an advantage over a child who doesn't.
I don't think it's up to the state and it's educational policies to compensate for parental choices, especially when those are already financially compensated through the welfare system.
Being in real poverty is a disadvantage in life, that is true, but so is SEN, or having a sibling with SEN, or having a parent with health issues, or having a close relative die when you are in education, or not having somewhere safe to store your things away from siblings in a home your parents own, or having your parents go through a messy divorce, or having your own health issues.
None of the above disadvantages are enough to trigger the PP and the benefits that brings, so why do we think that having a low enough income that is then topped up is enough to create state provided advantage of one family over another.
Without wanting to sound like a school child myself, it's just not fair. And while we should be striving to make education fairer, using PP to give some disadvantaged children an extra advantage over other disadvantaged children is never going to help that happen.