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 has aired on the UK network Channel 5's "Milkshake!" block since 2014. It features David Jason, known for Count Duckula and Angelmouse among other things, as Pip's uncle Skipper.
Before the show aired, there was a pilot made but has yet to be released apart from a short video with some footage of the pilot.
The show's pilot has designs that differ from the designs used in the show.