This tab is based on the Diana Vickers cover that can be seen here
http://www.youtube.com/watch?v=e0JqiMAbx0E

Its not the same key as the original but in my opinion the best acoustic version i've 
heard/played.
[Play the chords in the brackets bellow instead if you want to get the same sound as the
original song. Intro wont work with that though]

Em 779987     [F#m 244222]
Bm 224452     [C#m 446654]
C   335553      [D     557775]
D   557775      [E      779997]

INTRO
E------------------------------------------------------------|
B------8-----8--------7-------7--------5----------5-------7--|
C--------9---------------7-----------5----5----5--------7----|
D----9-----9--------7------7---------------------------------|
A--7-------------------------------3---------3--------5------|
E-----------------7------------------------------------------|

Em              Bm
Hush, don't speak
C                            C
When you spit your venom, keep it shut I hate it
Em                Bm
When you hiss and preach
C                             C
About your new messiah 'cause your theories catch fire
Em                 Bm
I can't find those silver linings
C                              C
I don't mean to judge
Em                 Bm
But when you read your speech, it's tiring
C                             C
Enough is enough

Em                                Bm
I'm covering my ears like a kid
C                                                           C
When your words mean nothing, I go la la la
Em                                                Bm
I'm turning off the volume when you speak
              C                                                    D
Cause if my heart can't stop it, I find a way to block it
  Em                    Bm
I go la la, la la la la la la la la la la
           C                             D
La la, la la la...
               I find a way to block it
Em                    Bm
I go la la, la la la la la la la la la la
               C
La la, la la la...


Pretty much that repeated throughout.
The guy in the video does some variations or something just before the verses and
occasionally replaces the D's with something else but i couldn't work it out and sounds just
as good with a D if, like me, you want to keep it basic.

Hope it helps. Please leave any comment or corrections.