This is an acoustic version of the song and my first attempt at writing a tab. I play it 
a bit slower than the original with a capo on the 2nd fret. Enjoy!
Chris Parker from Queensbury Bradford

Chords

Am    002210
G     320033
G5    300033
C     032010
C/E   032013
Em    022000
G/F   200033
D     x00232
Dsus4 x00233
Dsus2 x00230

(verse 1)

Am                       G   G5  G  G5
There's things that I regret
Am                                    C                            G
 G5  G
Like being called a nervous wreck and working up another sweat for you
Am                    G  G5  G  G5
There's nothing I can do
Am                                        C
For counterparts and bleeding hearts and all the things that fall apart for
G  G5 G
you

(bridge)

Em      C               G    G/F  G  
G/F  Em
I don't keep my secrets there
  C              D  Dsus4  D  Dsus2
I hide them everywhere

(chorus)

G         D            Em        C
I could deny, but i'll never realise
         G                D         C  C/E  
C  C/E
I'm just chasing rainbows, All the time

(verse2)

Am                   G  G5  G  G5
And then I missed my cue
Am                        C                                G  G5
 G  G5
Everybody had a laugh and then went for an early bath, did you?

(bridge)

Em      C               G    G/F  G  
G/F  Em
I don't keep my secrets there, no no no
  C              D  Dsus4  D  Dsus2
I hide them everywhere

(chorus)

G         D            Em       C
I could deny, but i'll never realise
         G                 D       C   C/E  
C  C/E
I'm just chasing rainbows, All the time
        G             D              Em       C
I could deny (I could deny) but i'll never realise
          G                 D      C    C/E  
C  C/E
I've been chasing rainbows, All my life


(instrumental)

Em G D C
Em G D C
Em G D C
Em G C D Dsus4 D Dsus2

(chorus)


G         D            Em       C
I could deny, but i'll never realise
          G                D       C  C/E  
C  C/E
I've been chasing rainbows, All the time
          G           D              Em       C
I could deny (I could deny) but i'll never realise
          G                 D      C  C/E  
C  C/E
I've been chasing rainbows, All my life
          G     D    Em   C
I could deny
          G     D    C  C/E  C  
C/E  G
I could deny