I believe I can distinguish hearing spoken English accents
I believe I can convincingly imitate accents from areas other than the one I was born in to a level of
Here I provide more detail about how well I can distinguish and/or imitate regional spoken English accents.
When I started watching Orphan Black, I thought, "Wow, that's a really good 'Southern Hemispherical person who's moved to North America' accent."
And then in the next episode, it's explicitly mentioned that Sarah and Felix are originally from London.
Er. Sorry, no, that's not a London accent, let alone a British one. I've been in Britain long enough to be able to distinguish accents to a level of "specific regional areas". But I can't, say, tell a Brummie accent from a Black Country accent, and I most certainly would not attempt to imitate either. I can cosplay a decent "posh train announcement" or "BBC Radio 4 news" accent and that's my limit.
I certainly find listening to different accents and being able to identify them far easier than imitating them, and the rest of the show is very enjoyable, so I'm happy to pretend that Sarah and Felix's origins have simply been misidentified in canon. :P