fantafilter

I heard a song as I was passing by a music store (HMV) in the UK a few weeks ago - I couldn't stop to ask who it was at the time. The artist sounded like Data Romance; electronic, but slow/melancholic/dark. Female vocals - haunting, ethereal. The lyrics were too indistinct for me to make out, but it was in English; it was mumbly rather than belted out. The accent was English rather than American. They must be signed/reasonably mainstream since they were playing in HMV, and it sounded like it was from the last decade rather than earlier. Not much to go on I'm afraid, but any suggestions would be greatly appreciated. I'd like to hear more artists like Data Romance even if I can't find the particular song I'm after