i had the same rattles as a few people metioned: boot rattle and top left of speedo
bootlid: i replaced all the metal clips that were bent and where the bottom of the plastic trim of the boot touches the plastic trim bodywork (if u open the boot and look directly at the bottom of the plastic trim u will probably see where its been rubbing) i used "fab foam". got it from an arts and craft
shop... about 75p for an A4 sheet, self adhesive about 2mm thick foam. stuck a spall square of that where the "rub" marks were and no rattles now
speedo: undid the screw holding the plastic (underside of the visor bit over the speedo) and pulled it apart just enough to stick really thin strip of fab foam in there (cant see it as its inside). did the screws back up and no more rattles!!
there are a few really quite ones now... but i cant tell where they are coming from!! so im going to leave them