If you need to contact Meridian direct, go through your premium dealer to open the line of communication. Once open, you should get the assistance you need from the people best placed to give it. The Meridian of old still seem to be there, but the Premium Partners seem to act as gate keepers.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).