James Norton would often visit Belfast and spend time playing with toys in Daniel Lamont's bedroom. He said Daniel would visit the set and be excited to act alongside him because of it.
The film is based on a true story - although the identity of the real father and son has always remained anonymous.
James Norton has said that working alongside Daniel Lamont was one of the greatest experiences of his career.
Acting debut of Daniel Lamont.
James Norton was trained by a professional window cleaner for his role.