Simergy Limited was a company which appears to have been formed by Geoff Crammond to develop his Grand Prix games. In the manual for Grand Prix 4, the company is stated to have exclusively licensed "motor sport simulation technology" to the publisher, Infogrames.
The manual quotes a web address of www.simergy.com, but this is now in use by a different company.
Companies House records show that the company (Registered Company No. 3754195) was incorporated on 15/04/1999 and dissolved on 29/11/2005.