Looks like they were based in Tunbridge Wells, but it also looks - from sleuthing around in company registrations - as though they shutdown in 2014
Based upon the signature being used here:
http://web.archive.org/web/20040907202818/http://www.networkdynamic...
I'm going to guess that their admin was Guy Sprackland, their MD, as his name also appears in the PCForm license terms.
It looks as though they ceased commercialising PCForm in 2006.
I have put PCForm in the SCL
https://www.hpcfactor.com/scl/1067/Network_Dynamics/PCForm_Visual_Ap...
Along with the v3 PocketC runtime
https://www.hpcfactor.com/scl/1068/OrbWorks/PocketC_Runtime/version_...
Mr. Sprackland, if you see this post. I hope that you will consider making the 1.25 release of your tools available to the community once again under our Exemptionware license -
https://www.hpcfactor.com/downloads/exemptionware/