Piece of plasterboard / bonding plaster (Purley CR2)

Hi everyone. I'm looking for a piece of unused/undamaged plasterboard (about 2ft square?) to repair a football-sized hole in someone's home. I'm also looking for any bonding or finishing plaster if anyone has some left over from a project? Usually these things are left lying around so rather than dump them, I'd be happy to collect and make use of them. I can collect from anywhere within the borough. Thanks!