CB Postcodes 

Including: Newmarket / Haverhill / Sawston / Duxford / Saffron Walden / Clavering / Cambridge / Haslingfield / Papworth / Over / Cottenham / Burwell / Foxden / Arkesden - and nearby villages

CM Postcodes

Including: Manuden / Bishops Stortford / Stansted, Hatfield Heath / Felsted / Dunmow / Thaxted / Henham / Braintree / Finchingfield – and nearby villages

CO Postcodes

Including: Coggeshall / Feering / Tiptee / Mersea / Colchester / Clacton / Frinton / Harwich, Manningtree / East Bergholt / Lavenham / Sudbury / Clare / Bures / Hundon / Birdbrook / Sibble Headingham – and nearby villages