'They don't get subbed if they can't afford it. Where would that money come from? '
At our C of E primary the children are subbed, if needed, from a special fund set up hundreds of years ago to assist with education in the parish.
I smirk when I think of this as faith schools are so much maligned (well, mainly on on MN, round here they're not). But this is an example of walking the talk. This is actually what Christianity can do well: discreet assistance to children who need it, done at a local level, in consultation with the headteacher and local charities.