Small Offcut(s) Of 25mm Celotex/Kingspan 450mm Square (Shevington Vale WN6)

I would appreciate a small square of 25mm/1inch thick Celotex/Kingspan insulating board 450mm square to insulate my beehive roof. I can use any offcuts from the skip or that you are throwing out. I can glue them together to form a decent insulating board. Thanks.