Another from West Yorkshire - more specifically, Shipley!
You need a bit of heat to losen it up, maybe boil the kettle and leave it to cool for a few minutes then pore it over and they should come off using your fingers. Bit of tardis will remove any excess glue.
DONT PUT A GTI BADGE IN REPLACEMENT
eBay is usually a good start for Monzas. Monza II's are the 18" version.