The clip begins with the birthday boy opening a giant card from his parents, who asked him to "read it out". "Happy 21st birthday, Charlie," he duly responded, oblivious to what is to come.

In less than 24 hours, she received more than 3,000 messages online for the soon-to-be birthday boy, with dozens of cards arriving through the door this morning alone.

This is the incredible moment an autistic man from Manchester discovered he had been sent more than 10,000 cards and gifts for his 21st birthday from well-wishers across the globe.