I had an old insert lying around so I used that, a couple of inches wide and length wise and upto about 4mm at its thickest point, several bits were used along its length. this was then forced in gently between the bottom of the foam insert and the bumper, a little dollop of glue or mastic to keep it in place, foam to foam only, and not on the bumper,
basically you are forcing the insert into the top of the bumper so as to reduce the gap at the bottom of the foam.
Wait for it to dry before refitting the bumper to the car, a tip is to smear a little bit of grease to the front edge of the crash beam so as to ease the now very tight bumper into place.
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