my grill hasn't bubbled up at all. Think yours liam is more the U shaped stuff (like the stuff you could put along the edge of doors to protectect the paintwork) if I remember correctly. That is no longer available in Halfords and only the more flatter section with adhesive backing in two widths is in stock.
Some pictures here of the halfords kit fitted
http://www.350z-uk.com/gallery/thumbnails.php?album=51