What the hell is an "Uk" accent? So a posh southern English accent would be the same category as a northern one? I get that considering nearly every city has its own dialect of English it would hard to offer some sensible mapping but it still feels kind of wrong.
If I search for the word "climate" in "Uk", "Irish" or "New Zealand" I get the same British English video, otherwise a Scottish English video for US. Don't offer me that many choices if you are going to lump them all together anyway.
Honestly they should have just offered a switch between American English and "British English" (the Received Pronunciation that many learn at school).
Other than that, seems like a great idea and already working reasonably well.