All my P21S product bottles say the product is made in Germany... so hopefully it should be available in Europe. It appears that the P21S name may be a trademark of the US importer, Brookside Import Specialties in Branford, CT, USA. They list it also as a "Smartparts" product on the bottle...
It appears P21S stuff may be Dr. Wack products?... see
http://autopia.org/forum/showthread.php?p=483416#post483416