Hi this my first tab but I'm pretty sure its accurate, i'm open to all comments 
and any corrections you may have :)

Right well there isn't any guitar for the first bit, so just play the chords C F 
Am and then back to F I play it like this:

e|---8--8--8---1-1-1--5-5-5--1-1-1-1-1--|
B|---8--8--8---1-1-1--5-5-5--1-1-1-1-1--|
G|---9--9--9---2-2-2--5-5-5--2-2-2-2-2--|
D|---10-10-10--3-3-3--7-7-7--3-3-3-3-3--| x6 On the 2nd and 6th time strum
A|---10-10-10--3-3-3--7-7-7--3-3-3-3-3--|    the last F once.
E|---8--8--8---1-1-1--5-5-5--1-1-1-1-1--|
                             \_______/
                  Downstroke and upstroke chord alternatively

Verse
e|---8--------8---------|
B|---8--------8---------|    There is an Am barre chord added in the second 
G|---9--------9---------|    time around, but its up to you to add it in as
D|---10-------10--------| x2 you could add it after every C chord apart from
A|---10-------10--------|    the last time.
E|---8--------8---------|

Chorus
e|------------------------------------|
B|-----8-------8-------8---10-10-8----|    On the last time end on the first
G|---9---9---9---9---9---9---------9--|    10 note.
D|------------------------------------| x4
A|------------------------------------|
E|------------------------------------|

Post-Chorus
e|------------------------------------------|
B|------------------------------------------|
G|------------------------------------------|    I prefer playing these octave
D|---10-10-10-10-10s3-3-3--7-7-7-7-7s3-3-3--| x3 chords but you could just as 
A|---x--x--x--x--x--x-x-x--x-x-x-x-x-x-x-x--|    easily play them as power 
E|---8--8--8--8--8-s1-1-1--5-5-5-5-5s1-1-1--|    chords.

2nd Verse
e|---------------------------------------------|
B|---------------------------------------------|
G|---------------------------------------------|    Again, could play as 
D|---10-10-10---10-10-10--5--7-7-7---7-7-7--5--| x2 octave chords.
A|---10-10-10---10-10-10--5--7-7-7---7-7-7--5--|
E|---8--8--8----8--8--8---3--5-5-5---5-5-5--3--|

e|----------------------------------------------------|
B|----------------------------------------------------|
G|----------------------------------------------------|
D|---10-10-10---10-10-10--10--10-10-10---10-10-10--10-|
A|---10-10-10---10-10-10--10--10-10-10---10-10-10--10-|
E|---8--8--8----8--8--8---8---8--8--8----8--8--8---8--|

e|-------------------------------------|
B|-------------------------------------|
G|---7-7-7-7-7-7-7-7-------------------|
D|---7-7-7-7-7-7-7-7--3-3-3-3-3-3-3-3--|
A|---5-5-5-5-5-5-5-5--3-3-3-3-3-3-3-3--|
E|--------------------1-1-1-1-1-1-1-1--|

Bridge
Just strum Dm, F, Am, F, Dm, F, preferably barre chords, 8 times each.
e|---5--1--5--|
B|---6--1--5--|
G|---7--2--5--|
D|---7--3--7--|
A|---5--3--7--|
E|------1--5--|
     Dm F  Am
Then play:

Chorus
Post-Chorus

again.

Solo
e|-------------------------------|
B|---13-15-17--10-8-6--10-12-13--|
G|-------------------------------| x2 Its a bit hard for me to get right
D|-------------------------------|    but this is roughly how it sounds,
A|-------------------------------|    will correct it if I can figure it out.
E|-------------------------------|

Bridge again then end on the C barre chord.

Have fun and I hope you enjoy this beautiful song :)