I havent’ played for long, but so far in medieval Bohemia I’ve heard various different types of Brittish accents, including I think one Scottish, but also American and and I think one Canadian! lol. 
This is not a big deal to me. I still think the game kicks-ass. However, I’m a games developer myself, and at my work, we use a lot of the actual development team to do voice-acting. Looking at their team, they seem to be almost entirely Czech. I wonder why they didn’t do the same? I can understand developers are not actors, maybe they didn’t want to, or didn’t have the (acting) skill necessary. It usually turns out sounding pretty good for us anyway. It would have been awesome & more realistic if all the characters (including Henry) spoke with a Czech accent.
But given they didn’t want to use their own team, and didn’t want to use Czech accents, and hired native-english-speaking hired professionals (I assume) instead … why such a weird variety? All English would have been fine, and fit the medieval theme okay. All American would have been weird in a medieval theme, but still at least consistent.
… and to think, this game is copping flak from some SJW circles for not showing enough “cultural variety”. There is Canadians in ancient Bohemia! C’mon.
P.S. for my 2c, they could have thrown all the voice-acting out the window and just used text, allowing them to include lots more variety in conversation. But I’m a weirdo on that probably.