"The Fireman Sam people" being formally known as Bumper Films, but let's be honest with ourselves, do most people know any Bumper Films shows other than Fireman Sam?
Unlike the Fireman Sam theme song, I can't find a full version of the Joshua Jones theme song. Perhaps the extended version of the Fireman Sam theme song was only created after that show became this massive hit, meanwhile Joshua Jones wasn't nearly as successful, so there was no demand for an extended version of the song. Just guessing!
Also, obligatory "oof" at the Polish version being just a voiceover dub...
I found a Reddit thread asking Romani people for their thoughts on Joshua Jones as representation, and the top comment said, "I was today years old when I discovered one of my favourite TV characters when I was a child was Roma." — So I dunno, if there's Roma who grew up loving the show without realizing the main character was "one of them", can we really attribute the show's lack of success to the main character's ethnicity?