Pip Ahoy! (partially found unaired pilot of Milkshake! animated series; 2013)
From The Lost Media Wiki
Pip Ahoy! is a preschool show produced by Cosgrove-Hall-Fitzpatrick Entertainment (A spiritual successor to Cosgrove-Hall Films) which airs on the UK network Channel 5's "Milkshake!" block from 2014 to current which featured David Jason (of Count Duckula, Angelmouse and the original "Danger Mouse" fame) as Pip's uncle Skipper
Before the show aired, There was a pilot made but never shown
The show's pilot has designs that differ from the designs used in the show
YouTuber "A for Awesome" only has a 44 second sample of the pilot [https://www.youtube.com/watch?v=hmtYmqfi9tg]