Molotov Jukebox

I just caught the end of a band playing on the bottom floor of One New Change today. Then lots of people were waiting for an autograph from the lead singer. She looked vaguely familiar but I decided not to join the throng.
Googling at home I find the band, Molotov Jukebox is fronted by Natalia Tena, who was Nymphadora Tonks in the Harry Potter films and Osha the wildling in Game of Thrones.
Doh!
Well, at least I got her photo.