I don't know how accurate it is. This is just the way I've always played it. It sounds 
to me. This is my first tab, so some cronstructive criticism would be nice.

"Promised the world.. they promised the world.."

G---------------------------------------------------------|
D---------------------------------------------------------|
A-------------------------------5-5-5---7-7-7-(x3)--------|
E-5-5-5-5---3-3-3-3---5-5-5-5-----------------------------|

G---------------------------------------------------------|
D---------------------------------------------------------|
A-------------------------------5-5-5---7-7-7-0~----------|
E-5-5-5-5---3-3-3-3---5-5-5-5-----------------------------|

"They promised the world, they promised the world"

G---------------------------------------------------------|
D---------------------------------------------------------|
A---------------------------------------------------------|
E-555-333-(x3)--555-333-222-333-(x3)----------------------|

"Nothing is sweeter" (Once it gets to the 555-777 there is a fast tempo change.)

G--------------|------------------------------|
D--------------|------------------------------|
A--------------|----------------------7~-9----|
E-555-333-(x2)-|-555-777-999-10-10-10---------|

"With hope... and home.."

G-----------------------------------------------------|
D-----------------------------------------------------|
A--------------------------------------------7~-9-----|
E-5-5-5-5-5--3-3-3-3-3--555-777-999-10-10-10----------|

"Of love.."

G-------------------------------------------------------|
D-------------------------------------------------------|
A--------------------------------------------777-999----|
E-5-5-5-5-5--3-3-3-3-3--555-777-999-10-10-10------------|

[Chorus again "They promised the world."]

[Play "nothing is sweeter" again]

[Play "of love.." again]

"Selfishly.. selfishly"

G-----------------------------|
D-----------------------------|
A-----------------------------|
E-555555-444444-555555-444444-|

Then there's a bunch of 5-4 variations. Just listen and you'll get it..

"A chorus.."

G------------------|
D------------------|
A------------------|
E-5~--3~--2~--3~---| (repeat this a a bunch of times)

"Ten years and counting.."

G---------------------|
D---------------------|
A---------------------|
E-5555-3333-2222-3333-| (repeat until end..)