I was watching a youtube clip of Marcus Mumford playing this song with a capo on 
the 5th fret and noticed it was here so I decide to figure it out.

Enjoy!

Capo on the 5th

G
I am just a poor boy
                                 G/F#   Em
Though my story's seldom told
          D
I have squandered my resistance
      C                                                   G
For a pocket full of mumbles such are promises
   G/F#      Em
All lies and jests
        D                             C
Still a man hears what he wants to hear
                        C/B   G
And disregards the rest

         G
When I left my home and my family
                        G/F#  Em
I was no more than a boy
          D
In the company of strangers
         C                                         G
In the quiet of the railway station running scared
G/F#    Em                 D                                  C
Laying low, seeking out the poorer quarters
                                    G
Where the ragged people go
                D                                        C Em  G/F#   G
Looking for the places only they would know

Chorus:
        Em
Lie-la-lie
       D                                
Lie-la-lie la lie-la-lie
       Em
Lie la lie
       C                   D            G
Lie-la-lie la la la la lie la la la la lie

            G
Asking only workman's wages
                        G/F#      Em
I come looking for a job
                  D
But I get no offers,
         C                                                         G
Just a come-on from the whores on Seventh Avenue
  G/F#  Em                     D                                                   C
I do declare, there were times when I was so lonesome
                    G
I took some comfort there

         G
Then I'm laying out my winter clothes
                   G/F#  Em
And wishing I was gone
          D
Going home
                C                                               G
Where the New York City winters aren't bleeding me
      G/F# Em         D
Bleeding me, going home

Repeat the Chorus (He sings it a little bit different but it's
difficult to distinguish la's and lie's)

During solo play the verse chord progression 

          G
In the clearing stands a boxer
                       G/F# Em
And a fighter by his trade
              D 
And he carries the reminders
      C                                 
Of ev'ry glove that layed him down
        ? G
Or cut him till he cried out
                     G/F#   Em
In his anger and his shame
         D                      C
"I am leaving, I am leaving"
                              G
But the fighter still remains

        Em
Lie-la-lie
       D                                
Lie-la-lie la lie-la-lie
       Em
Lie la lie
       C                   D            Em
Lie-la-lie la la la la lie la la la la lie

        Em
Lie-la-lie
       D                                
Lie-la-lie la lie-la-lie
       Em
Lie la lie
       C                   D            Em
Lie-la-lie la la la la lie la la la la lie

       D                                
Lie-la-lie la lie-la-lie
       Em
Lie la lie
       C                   D            G
Lie-la-lie la la la la lie la la la la lie