Looks like I've underpriced my GS by a a couple of thousand percent! I'll nip out and get a can of matt paint tomorrow...
http://www.ebay.co.uk/itm/2005-MASE...624568?hash=item2cb8f4fdf8:g:~jgAAOSwA3dYf2Qy
http://www.ebay.co.uk/itm/2005-MASE...624568?hash=item2cb8f4fdf8:g:~jgAAOSwA3dYf2Qy