As with all of Stu's bass lines, he improvises a lot, so much that there is 
almost no one "basic line". Therefore with this great song I have just 
transcibed what i see to be the basic line, hopefully presenting you with a 
starting point from which you can work out all of stu's variations and/or 
hopefully come up with some of your own!! There are three main sections in 
this song.
Basic tab conventions
*= dead note  p= pull off
h= hammer on

The Intro

The intro line has four main chords, and lot's of variations of these four 
main chords can be played. In this stu does a lot of bends(up), so i have 
bracketted the notes that he bends, however this does not mean that he bends 
these notes every time!! He also often pulls on to the notes i have 
bracketted, from the fret immediately after the note eg pull off the 5th 
fret to the 4th fret. This line has so many variations yet i can't be 
bothered writing them all out!

G---------(4h5)-------------|----------(2h3)-------------|
D---------------------------|----------------------------|
A------7--------7-----7---7-|--------5------5----5----5--|
E--5--------------5-----5---|----3-------------3---3-----|

G---------(7h8)-----------|----------------------------|
D------5-------5----5---5-|--------(5h6)---------------|
A--3-------------3----3---|-----3--------3-----3-----3-|
E-------------------------|--1--------------1-----1----|

The Fast Section

After the intro the song drops into a much faster paced section, and stu's 
line provides endless opportunities for variations! Once again i've just 
transcribed the "basic line". In about the middle of this section there is a 
sort of break, where the basic chords above are played and then it drops 
back into the fast paced section, where stu plays a very fast variation, 
which i've tabbed what i think he plays (bit of a challenge). Each bar is 
repeated, and

G-----------4-4--------|-----------2-2---------|
D----------------------|-----------------------|
A-----7-7--------7-7---|-----5-5--------5-5----|
E--5-----------------*-|--3------------------*-|

G-------------7-7-------|------------------------|
D--------5-5------3-3---|------------5-5---------|
A--3-3------------------|-------3-3-------5-5----|
E---------------------*-|--1-1-----------------*-|

Fast Variation

G--------------7-----------|-------------5-----------|
D-------7-9-10--10-9-7-9-7-|-------5-7-8---8-7-5-7-5-|
A--------------------------|-------------------------|
E--5-5---------------------|--3-3--------------------|

G--------------5-----------|-------------3-----------|
D--------5-7-8---8-7-5-7-5-|-------3-5-6---6-5-3-5-3-|
A--3-3---------------------|-------------------------|
E--------------------------|--1-1--------------------|

The End Section

After the fast section the song goes into a new section with the bass 
running up and down some scale (some major scale variation i think...i am 
weak on theory haha). This can be varied a lot, including playing fast 
triplets on some of the notes like stu does.

G-------------------------------------------|
D------------------------------5--6---------|
A-----------5------------6--8--------8--6---|
E--5--7--8-----8--7-------------------------|