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There's a few tabs / chords on here but I believe this one is the most accurate for solo guitar interpretation. The verses are just G / Dm / C (all open) the timing is slightly difficult to get right but listen to the recording to hear the changes. Then the chorus is C / Bm / G / Em / D / Bm / C (all open except Bm). So it goes...
GDo they Cknow Bmthose Gdays are Emgolde... D..eee.. Bm...eeen C
CBuild A Bmrocket boys G
etc etc etc, Hope that gives you some idea of how it goes. In the verses, the Dm to C progression might change to something else at some point but I can't work out what exactly. Maintaining the Dm to C change doesn't stick out too badly (it may even be technically correct) and only a pedant would notice in a performance. Any comments appreciated.