sorry if this is the wrong spot but it's my frist post so hi to everyone!
I came across a few Keira/Atonement fan vids to 'Apologise' which i think ties in nicely with the overall theme of the movie lol. Here's one in particualr which matches the lyrics quite nicely.
incase that doesn't work here's the link
http://au.youtube.com/watch?v=ROlHEt3IOXI