The Backyardigans (partially found British dub of Nick Jr. CGI-animated series; mid-late 2000s)
The Backyardigans is a Canadian-American television series that aired on Nick Jr. from 2004 to 2010. Like Oswald, Wonder Pets!, and Blue's Clues, it was redubbed for the UK market. The theme song for the dub has been uploaded to YouTube, but no full episodes of it have been found and it's unknown if any episodes were officially released in any way.
Lizzie Waterworth is known to have been the voice of Austin, as he sounds exactly like Horrid Henry.