The song is called Sweet Disposition by a band called Temper Trap.
It has been doing my head in! I didn't know the band or the lyrics but heard the song on the trailer and knew i'd heard it before (on a trailer for 500 days of summer as it turns out!).
I went all over the internet and ended up on play.com and looked for new indie band releases and you tubed them! It was reeeeeeeally doing my head in! Hope that helps :)
Numb3rs - 2005 Devil Girl 6-13 was released on: Canada: 22 January 2010 USA: 29 January 2010 Japan: 2 May 2012
Numb3rs - 2005 Arm in Arms 6-12 was released on: Canada: 15 January 2010 USA: 15 January 2010 Japan: 25 April 2012
the song is Pixie Lott: Its all about tonight
I think it might be called " Something in the water " Maybe not..
Numb3rs - 2005 Hollywood Homicide 4-2 was released on: USA: 5 October 2007 Germany: 6 April 2008 Hungary: 8 September 2008 Japan: 25 January 2010 Finland: 21 January 2011
Ketch My Drift Channel Islands - 2010 was released on: USA: 16 January 2010 (Idyllwild International Film Festival)
late January / Early February
it will be back 27th January on channel 4 Wednesday 2010
Wednesday 27th January 2010, 9pm Channel 4.
January 12 2010 !!! On Channel Five
Numb3rs - 2005 When Worlds Collide 4-18 was released on: USA: 16 May 2008 Netherlands: 20 October 2008 Hungary: 5 January 2009 Japan: 17 May 2010
Numb3rs - 2005 Arrow of Time 5-11 was released on: USA: 9 January 2009 Hungary: 30 November 2009 Australia: 16 April 2010 Japan: 6 April 2011