- Alphasense
- 0870 7565973 - Chelmsford Rd, Dunmow, Essex, CM6 1XN
- Gaspro Gas Engineers
- 0845 3736600 - 93 Fullers Mead, Harlow, Essex, CM17 9AT
- Blue Flame Gas Services
- 01206 799994 - Commerce Wy, Colchester, Essex, CO2 8HX
- Blue Flame Gas Services
- 01206 799820 - Commerce Wy, Colchester, Essex, CO2 8HR
- Colchester Gas Services
- 01206 735230 - Whitehouse Cott Abberton Rd, Fingringhoe, Colchester, Essex, CO5 7AR
- Colin Birch Gas Services
- 01206 308080 - 42 Sydney Street, Brightlingsea, Colchester, Essex, CO7 0BE
- P.D Eaves
- 01206 250279 - Aingers Gn Weeley Rd, Great Bentley, Colchester, Essex, CO7 8NB
- G.B Magill
- 01206 865384 - 52 St. Johns Road, Colchester, Essex, CO4 0JW
- Nigel Bennett
- 01376 570985 - 10 Millers Mead, Feering, Colchester, Essex, CO5 9SS
- B Shafe & Sons
- 01255 813310 - 63 Frinton Road, Holland-on-Sea, Clacton-on-Sea, Essex, CO15 5UH
- B S R Bathroom Showroom
- 01268 735387 - 24 London Road, Wickford, Essex, SS12 0AN
- Causeway Marine
- 01621 869143 - 34 Elysian Gardens, Tollesbury, Essex, CM9 8QN
- CN3 Gas Engineers
- 0800 3285372 - 53 Tallow Gate, South Woodham Ferrers, Chelmsford, Essex, CM3 5RX
- Essex Gas
- 01702 203671 - 215 Plumberow Avenue, Hockley, Essex, SS5 5NZ
- G B Gas Services
- 01245 355200 - 45 Saffron Gardens, Wethersfield, Braintree, Essex, CM7 4BL
- Gas Lane Pipework Services
- 01702 612226 - The Brookside Cntr Sumpters Wy, Temple Farm Industrial Estate, Southend-on-Sea, Essex, SS2 5RR
- John Corby Gas Engineer
- 01621 742832 - 63 West Avenue, Mayland, Chelmsford, Essex, CM3 6AE
- Marlin Mechanical Services
- 01268 534949 - Pipps Hl Indust Est Howard Chase, Basildon, Essex, SS14 3BB
- E & B Gas Control Systems
- 01474 813416 - The Sidings, Meopham, Gravesend, Kent, DA13 0LX
- Alhco
- 0845 6032514 - Unit 11 Hovefields Industrial Estate, Basildon, Essex, SS13 1EB
- Kohler Workshop
- 01245 344280 - 24 Beehive Lane, Chelmsford, CM2 9TQ
- Assured Gas Services
- 01376 503322 - 3 St. Marys Road, Rivenhall, Witham, Essex, CM8 3PE
- Combi Boilers
- 01279 417818 - 34 Pye Cnr, Gilston, Harlow, Essex, CM20 2RB
- R.t.plumbing Ltd
- 01268 478568 - 15 Gordons, Basildon, Essex, SS13 3DZ
- SGW Services
- 0845 8060771 - 45 Kings Road, Southminster, Essex, CM0 7EJ
- Energy Efficient Heating
- 01206 867172 - 38 Wimpole Rd, Colchester, Essex, CO1 2DL
- Dougie McClure Gas And Heating Services
- 07872 919027 - 17 Boadicea Way, Colchester, Essex, CO2 9BQ
- Burtons Plumbing
- 01702 307279 - 86 Richmond Avenue, Southend On Sea, Essex, SS3 9LG
- Peter James Services
- 0845 6835477 - 5 Burses Way Hutton, Brentwood, Essex, CM13 2PL
- AMR Heating Ltd
- 0845 8391235 - 19 Hillview Close Rowhedge, Colchester, CO5 7HS
- J A Plumbing And Heating
- 01279 300741 - 28 Kingsland, Harlow, Essex, CM18 6XJ
- J.v Heating & Plumbing
- 01375 891126 - 15 Bonham Drive, Orsett, Essex, RM16 3HF
- Gas Group
- 07932 724417 - 1 Copshall Close, Harlow, Essex, CM18 7LH