Bag of Polystyrene and other packing material (South Beddington SM6)

I have a bag of large pieces of Polystyrene together with other packing and wrapping material including some bubble wrap and smaller pieces of Polystyrene . A friend used to take the large pieces and cut them down for packing his carvings. He has stopped doing it so does not need any more. Can anyone use them for packaging or even insulation?
 If you would like to know more about cutting the large pieces my friend could explain what is needed.