How would we know which is red and which is blue?
There's no such thing as Great Britain.
I wish Americans would stop trying to do British accents, they (with a few rare exceptions) suck at it. Dick Van Dyke is going to hell...
Now, THIS is what I want to learn. American cursing is dead easy but mastering British cursing, especially the lower class cursing, I don't even know where to begin.
Eh, I don't see the fuss. She exaggerates the words, yes, which doesn't work for actual conversation, but for the point of getting across the basic differences in pronunciation it works great. They seem like helpful videos for actors to get started with (even if it isn't a perfect be-all, end-all solution).
Going slightly off-topic, I always thought James Marsters and Alexis Denisof did pretty good examples of British accents on Buffy the Vampire Slayer (especially early on). Equally, I've heard some bloody awful American accents from British actors....getting across the basic differences in pronunciation...