The Fattest Man In Britain has a very similar plot to the independent film Tomorrow's Promise which was released 6 months ago!
Tomorrow's Promise tells the tale of an unlikely friendship between Jack Clapton and Connor Rogers. Jack is an old war veteran who is seeing out his last few weeks in a hospice, reflecting on an eventful life. Connor is a troublesome teenager who is assigned on community service to him and even though they are opposites they become friends.
Coincidence? Watch Tomorrow's Promise on the website and tell me your thoughts!