Maggie Thatcher took away the free milk from schoolchildren
Yes, Mrs Thatcher was the Secretary of State for Education who stopped free milk for some schoolchildren.
Often overlooked is that the cuts started under Harold Wilson whose government scrapped free milk to secondary schools in 1968. Here

This seems the same sort of view used by those who blame Mrs Thatcher for closing the mines, without looking at the fact that more mines were closed (affecting a greater number of miners) under Labour than under the conservatives.