here is the "Guns of Brixton" bass tab, the other tabs i disliked, my bass teach was a clash 
fan and he tabbed me out multiple songs , well heres his transcript.

Basic info
Band:The Clash
Album:Guns of Brixton
Bassist:Paul Simonon

main parts
G——————————————  
D———0—44444—0——  
A—2———————————2
E——————————————

G—————————————
D———0—55555—0—
A—2——————————2
E—————————————

second diddly
G—————————————————————————
D——————7—9——————————79————
A—99999————————99999——————
E——————————7—9—————————7—9

thats it, easy song , very cool patern, plz contact me if something is wrong. i did NOT 
indicate the # of times each pattern is played , if u listen to the song its easy to play 
along with . enjoy