I've wondered similar things about most of the programmes my kids watch. "Paw Patrol" = "team of genetically-enhanced cyborg dogs", etc. And my wife and I came to the conclusion a long time ago that Fireman Sam takes place in a postapocalyptic setting with about six survivors where nothing exists outside Pontypandy.
I'm too lazy to ask on main site, but if anyone wants possible tons of rep, here's what's been bugging me for the last year: how much of Highlander plot line did Freddie Mercury know before writing the songs that were used in Highlander soundtrack?