A bit before my time , but Eastern Counties Motor Club were going from the 1950s .
http://www.ecmc.co.uk/site/index.php/about-us
And were the first club to run actual races on Snetterton .
Don,t know any details of your event , but recognise a couple of names from when I joined ECMC later .
And can,t remember a Clacton & District Motor Club , but that might have changed to Colchester & District MC , which was active for a lot of years later .