You're talking about the one with the sinks filling up with water in the toilet I think??
I don't think it is Creed, even though that's what everyone is saying. It's more ambient than Creed. I am trying to find it too.
I GOT IT!!!
The BBC says it's 4 tracks in total. The ambient one is Death In Vegas - Girls. I have found the track and it's the right one.
The other 3 are Creed (oops), Groove Armada - Remember & Sigur Ros - Svefn-g-englar.
ENJOOOY!!!