Duffy told The Daily Star: "There are lyrics in Warwick Avenue about certain exes. I won't pinpoint the song on any particular person but it was weird hearing it for the first time in public. When I was writing it I felt I got everything out of my system, but being there on the video set I got a bit upset. It came out of the blue. Writing songs can be weird. It's like writing in blood on the wall for everyone to see. And it's real blood because it's your personal emotions that are spurting out." (Source Warwick Avenue Songfacts). .