If your file follows the official Season 3 order, it likely contains this episode instead: Season 3, Episode 51.
There appears to be a numbering discrepancy between your file name and the official Horrid Henry series lists. While your file is labeled , the episode titled " Horrid Henry’s Big Breakfast " is officially designated as Season 4, Episode 51 . If your file follows the official Season 3
User blog:LTPHarry/Series 3 verdict list - Horrid Henry Wiki If your file follows the official Season 3