cm8Where is CM8? Home; Postcode; CM; CM8; CM8 is in the county of Essex. It contains the town of Witham, as well as Wickham Bishops, Silver End, White Notley, Rivenhall, and Beacon Hill.Crowd Media Holdings Limited (CM8) is involved in sale of information, entertainment and content and utility services for mobile phones and tablets; the sale of products direct-to-consumer;