This song by Hedley is in C.
These are the “cheat” chords I played…
Part 1a: Am7 - F2 - C2 - G4 - G
Part 1b: F2 - G - Am7 - F2 - G4 - G
Part 2a: C2 - Am7 - F2 - G4 - G
Part 2b: Am7 - F2 - C2 - G4 - G
Part 3a: Dm7 - F2 - Am7 - G4 - G
Part 3b: C/E - F2 - C2 - G4 - G
