The story of the how the song came to be has changed (unless I'm remembering wrong...)

Didn't Siobhan say for years that she wrote the song when Keren and Sara went on holiday without her and she was left alone and wrote the lyrics.

Now we have a new K+S version of the story?
I think Sara has said she reworked the song? (it was originally called Cruel) so she may have her own idea on what it's about. There's a similar differing of opinion on Robert DeNiro's Waiting.