There is enough food to go around to feed everyone in Britain - why should the poor bear the burden ?

There is always choice. Some choices are difficult to make because the chooser has preferences ingrained at an early age. They could be re-educated but that is not only a hard route, it imposes someone else's mores.

But what society chooses to give, can it not ask quid pro quo?

Try asking, you will get your answer! It will include a few choice adjectives and not a few verbs.

And I wonder about that plenty of food. Where does most of it come from? Here or not here. Change the parameters and you will see where the land lies. And we are discussing a change right now, not very eloquently, and with as much mess now as there will be soon. To bring it back to food - just watch the prices - and you will see. They ain't going down. Time will prove me correct. Least ways, I will be happy to be wrong............... if !