| Hadleigh Plumbing Services | 020 8449 1458 | | Rowley Green Farm, Rowley Lane, Arkley, Barnet, EN5 3HW |  Map & Directions |
| Paul Collins Ltd | 020 8449 0950 | | The Den, Barnet Gate, Arkley, Barnet, EN5 3HY | | Map & Directions |
| Colin Bullot & Sons Ltd | 01992 627407 | | 7 Glendale Walk, Cheshunt, Waltham Cross, EN8 9RJ | | Map & Directions |
| North London Gas | 020 8363 4613 | | 143 Willow Road, Enfield, EN1 3BP | | Map & Directions |
| R E Newton | 01707 642607 | | 33 Highview Gardens, Potters Bar, EN6 5PN | | Map & Directions |
| Able Plumbing | 020 8366 2801 | | Flat 9 Cheviot Court, Cheviot Close, Enfield, EN1 3UY | | Map & Directions |
| Brigadier Plumbing & Heating | 07956 295996 | | 79 Brigadier Hill, Enfield, EN2 0NJ | | Map & Directions |
| Academy Plumbing & Heating | 01992 701249 | | 120 Bertram Road, Enfield, EN1 1LS | | Map & Directions |
| A10 Boilers | 0800 037 9269 | | 128 Great Cambridge Road, Cheshunt, Waltham Cross, EN8 9ES | | Map & Directions |
| P Power | 01992 632571 | | 61 Hedworth Avenue , Waltham Cross, EN8 8AR | | Map & Directions |
| R P Gibbs | 01992 428844 | | 235 Turners Hill, Cheshunt, Waltham Cross, EN8 9DG | | Map & Directions |
| J D T Plumbing & Heating | 01992 630348 | | Appleby Street , Cheshunt, Waltham Cross, EN7 6QZ | | Map & Directions |
| Jc Plumbing | 01707 872451 | | 38 Bacons Drive, Cuffley, Potters Bar, EN6 4DU | | Map & Directions |
| Advanced Willow Watch | 020 8367 4224 | | 273 Willow Road, Enfield, EN1 3BU | | Map & Directions |
| T S G Mechanical Services Ltd | 01992 626211 | | 16 New River Trading Estate, The Fairways, Cheshunt, Waltham Cross, EN8 0NJ | | Map & Directions |
| Peter Russell | 020 8366 4153 | | 51 Lindal Crescent , Enfield, EN2 7RP | | Map & Directions |
| Andrew Neal Plumbing & Heating | 01707 656905 | | 15 Blunesfield, Potters Bar, EN6 5DG | | Map & Directions |
| Padlock Plumbing Of Enfield | 020 8366 9341 | | 49 St. Georges Road, Enfield, EN1 4TY | | Map & Directions |
| T A Plumbing & Heating | 020 8440 7104 | | 31 Sussex Way, Cockfosters, Barnet, EN4 0BQ | | Map & Directions |
| D Harvey Central Heating Services | 07720 886486 | | 2 Pendall Close, Barnet, EN4 9AZ | | Map & Directions |
| Norton Plumbing | 01992 461462 | | 179 Perrysfield Road, Cheshunt, Waltham Cross, EN8 0TL | | Map & Directions |
| A B Services & Co | 020 8363 1091 | | 2 Bewcastle Gardens, Enfield, EN2 7PH | | Map & Directions |
| P J Collins | 01992 634873 | | 3 Felstead Road, Waltham Cross, EN8 7HB | | Map & Directions |
| Hands G | 01992 624586 | | 172 Churchgate, Cheshunt, Waltham Cross, EN8 9DX | | Map & Directions |
| Parish D W | 01992 625183 | | 37 Cromwell Avenue, Cheshunt, Waltham Cross, EN7 5DJ | | Map & Directions |
| Fred Gray | 01992 308411 | | Ashwood, Barrow Lane, Cheshunt, Waltham Cross, EN7 5LN | | Map & Directions |
| Cuffley Developments Ltd | 07000 342434 | | 11a Hawthorn Road, Hoddesdon, EN11 0PJ | | Map & Directions |
| I C Roberts | 01707 659903 | | 38 Brooklands Gardens, Potters Bar, EN6 2LB | | Map & Directions |
| A S I Services | 01992 440305 | | 71 River Avenue, Hoddesdon, EN11 0JT | | Map & Directions |
| Ian Mcdowall | 01992 444660 | | 69 Roselands Avenue, Hoddesdon, EN11 9BA | | Map & Directions |
| L Libonati | 020 8440 9850 | | 145 Westpole Avenue, Cockfosters, Barnet, EN4 0BB | | Map & Directions |
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