The self tappers are poor quality and corrode, I had to use 'Mole' grips to get them out, they were replaced with galvanised self tapping screws. The bolts behind the headlamps were also rusted solid and were cut out with a small angle grinder. They were replaced with stainless and now front bumper removal takes 5 mins. If the grille was removable this job would be simple. Cheers.