This is the bass tab for 18-30 by Reverend and the Makers. This song has another 
yet simple bassline throughout. Just listen to the song and all becomes clear!!

Main Riff

G|----------------------------------------------------------------------------|
D|----------------------------------------------------------------------------|
A|2-2--2-2--2-2--2-2--0-0-0--(on intro, finish with 12-12-12 instead of the 0-|s)
E|----------------------------------------------------------------------------|

Chorus

G|--------------------------------------------------------------------|
D|-0-0-0-0-2-2-2-2----------------------------------------------------|
A|-----------------2-2--2-2--2-2--2-2--0-0-0--------------------------|
E|--------------------------------------------------------------------|

Main Riff
Chorus

Interlude

G|----------------------------------------------------------|
D|-0(x16)-2(x16)-0(x8)-2(x8)--------------------------------|
A|--------------------------0-------------------------------|
E|----------------------------------------------------------|

Instrumental
Then Finish with Main Riff Again (Come Back In With 12's On A String)