Chris Packham broke down in tears when he read a letter from Ken Bruce's autistic son, Murray.
The Springwatch star, 61, met up with the former Radio 2 broadcaster, 72 and Murray, 20 - who has never spoken and communicates via a tablet - on his BBC show Inside Our Autistic Minds.
After meeting the father and son, Chris, who has Asperger's Syndrome, asked Murray to come up with script ideas for his own film.
