HAVOC
Havering and S. Essex OC
NOR
Norfolk OC
SMOC
South Midlands OC
SOS
Essex Stragglers
SUFFOC
Suffolk OC
WAOC
West Anglian OC
*
CUOC
Cambridge University OC
*
DRONGO
DRONGO OC (ex-CUOC)
*
RAFO
Royal Air Force Orienteers
* Closed clubs (membership restricted to members of the organisation )