Been awhile since I first posted this so here is the 
updated way I play it now-for
anyone who cares. Alternating bass notes is easy after 
some practice but for the second
and third parts of the song you want to use a second 
guitarist. Phil and Viv played on
the recording. (Phil told me!!!)

Main Lick W/ fingers x 2

E|-2--3-5--7--5753--5-2---2--3-5--7--5753--5---| 
B|---------------------------------------------| 
G|---------------------------------------------| 
D|-0----0-------0-----0---0----0-------0-------| 
A|----0----0--------0--------0----0--------0---| 
E|---------------------------------------------| 


E|--2--3-5--7--5753--5-2-------------------------------
B|------------------------------3--------5-------------
G|-----------------------------0--------0--------------
D|--0----0------0------0----------------------------(7)
A|-----0-----0-------0-----0-2------2/3-------3/5------
E|-----------------------------------------------------

E|-----|    
B|-----|    
G|-----|(7) 
D|-----|    
A|-----|    
E|-----|    

End of main lick

This part use pick
                               ^ ^                  ^ ^

E|-10''--8''--6''--5''---------------------------------
B|----------------------6-5--8-6865-6--5---------------
G|----------------------------------------7--6--7--9797
D|--0---------0----------------------------------------
A|-------0-------0-------------------------------------
E|-----------------------------------------------------

E|-----| 
B|-----| 
G|-6-7-| 
D|-----| 
A|-----| 
E|-----| 


E|10''--8''--6''--5''----------------------------------
B|------------------------6-5-6-8--565-----------------
G|---------------------------------------7-6-7-------7-
D|-0---------0----------------------------------7-7----
A|------0---------0------------------------------------
E|-----------------------------------------------------

E|------| 
B|------| 
G|7-----| 
D|------| 
A|------| 
E|------| 


Play this part over the part above, then play main lick
 once again.

E|-10-8-7--------10-8-7--------8-6-5-------8-6-5------|
B|--------10-8-7--------10-8-7-------8-6-5-------8-6-5|
G|----------------------------------------------------|
D|----------------------------------------------------|
A|----------------------------------------------------|
E|----------------------------------------------------|

E|-6-4-3----------| 
B|-------6-4-3----| 
G|----------------| 
D|----------------| 
A|----------------| 
E|----------------| 


E|-6-4-3-------5-3-2---------------|-------------------
B|-------6-4-3-------5-3-2-3vvvvvv-|-------------------
G|---------------------------------|-------------------
D|---------------------------------|-------------------
A|---------------------------------|-------------------
E|---------------------------------|-------------------

Enjoy.
 *

^ ^ = hammer on/ pull off
vvv = vibrato
''  = fast picking
(7) = natural harmonics