Does Alice Englert remind you of Ashleigh Cummings?
Since I have it on Netflix, I just watched the first few eps of Jonathan Strange & Mr. Norrell.
Every time Englert was shown, I was racking my brains for who she reminded me of: her voice, vocal inflections, and even physical mannerisms. I finally realized that I thought this must be Cummings . . . until I came to IMDb to look it up.
The interesting coincidence is that they are both Australian (well, Cummings's parents are Australian; she was born in Saudi Arabia).