The contact details are:
GSPP Good Seed and Plant Practices
2805 PC Gouda
phone: +31 182 688 668
Fax: +31 182 688 667
GSPP is listed in the trade register of the Rotterdam Chamber of Commerce under number 24479194.
If you have questions about the interpretation of the GSPP standard, you can ask these via the GSPP manager, Mr. Sierd Folkertsma, by mail
Suggestions to improve the GSPP standard are also welcome.
You will receive a response as soon as possible.