The British Overton window includes a bit of the left so I would expect the average Brit to be better than the average American, that being said you just might not have seen the American ones, some I recommend:
InRangeTV- pretty much the one non-chud gun channel, if you don't want to see gun stuff he does have a couple of history videos (about labour/indigenous revolts)
Atun-Shei Films- history and short film guy, Checkmate Lincolnites! is a must watch series
Some more news- weekly single issue story, format got aped ~~by~~ from John Oliver
Adam Connover/Adam Ruins Everything- I am less familiar with his YouTube output but "Adam Ruins Everything", started as a webseries on college humor (now dropout) and got picked up as a TV show
College Humor/Dropout TV- it really started with Adams stint but the leftist outlook never really left, less long form essay and more general entertainment