This is more or less right:

EDIT (25 July 08): changed some Bm to F#m, that sounds more correct now.

    A  
For ladies who insure their cars,

E
Sheilas' Wheels are superstars,

          F#m
Girls are bored beyond endurance,

           D
Payin' too much for car insurance,

    Bm                   D
For bonzer car insurance deals,

F#m             E        A  D  A
Girls get onto Sheilas' Wheels.

      F#m
Women make the safest drivers,

         D
We could save a bunch of fivers,

    Bm                   D
For bonzer car insurance deals,

F#m             E        A  D  A
Girls get onto Sheilas' Wheels.