The main location for the Hong Ying school is in Leiden, The Netherlands.
This is the contact information:

Hong Ying "Centre of Excellence"
Johan Wagenaarlaan 14
2324 XD
Leiden (Zuid)
The Netherlands
www.hong-ying.org

Sifu Mark Horton can be reached by email:
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Link to Google Maps (click).

The map here shows the way by Public Transit from the Leiden Central Station.