Ours was an import and the French plates were pop-riveted on. After getting them drilled out, I put a bit of primer over the bare metal where the rivets had gone in and then stuck the UK plates on with the sticky fixer things supplied by fancyplates.com. The plate was still stuck on when we sold it two years later.
TBH the sticky things are usually OK unless the plate is on a very curved surface, in which case you're better off with either a plate holder or a couple of screws.
[url=http://www.peugeot206cc.co.uk/newowners?id=442]Ex owner number 442[/url]