I got advise from Mark and I bought some rivnuts and rivets off Mark. The rivets was a 4.8mm drill. You will need to get some from somewhere like screwfix as the local DIY stores don't seem to have them (either 4.5 or 5mm.)
Rivnuts depending on size. I measure the drills up agaist the rivnuts and it worked out at 9 or 9.5mm drills.
Hope that helps.
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