Which LDZ / Local Distribution Zone you are in has a significant effect on your gas bill. This applies to both the standing charges and the unit rates or price per therm. Unfortunately, it’s also something you can’t change, short of moving your business. Your LDZ also dictates who you will need to contact to upgrade or downgrade your supply or if you are looking for a new supply.
The SW area covers the following area.

Towns
Alcester |
Axbridge |
Axminster |
Ballyclare |
Banbridge |
Banwell |
Barnstaple |
Bath |
Berkeley |
Bideford |
Bodmin |
Bradford-on-Avon |
Braunton |
Bridgwater |
Bristol |
Brixham |
Broadway |
Bruton |
Buckfastleigh |
Bude |
Budleigh Salterton |
Burnham-on-Sea |
Callington |
Calne |
Camborne |
Carterton |
Castle Cary |
Chard |
Cheddar |
Cheltenham |
Chippenham |
Chipping Campden |
Chulmleigh |
Cinderford |
Cirencester |
Clevedon |
Coleford |
Colyton |
Corsham |
Craigavon |
Crediton |
Crewkerne |
Cullompton |
Dartmouth |
Dawlish |
Devizes |
Drybrook |
Dursley |
Evesham |
Exeter |
Exmouth |
Falmouth |
Faringdon |
Fowey |
Frome |
Glastonbury |
Gloucester |
Gunnislake |
Hayle |
Helston |
Highbridge |
Hinton Saint George |
Holsworthy |
Honiton |
Hungerford |
Ilfracombe |
Ilminster |
Ivybridge |
Kingsbridge |
Langport |
Larne |
Launceston |
Ledbury |
Lisburn |
Liskeard |
Looe |
Lostwithiel |
Lydney |
Malmesbury |
Marazion |
Marlborough |
Martock |
Melksham |
Merriott |
Minehead |
Montacute |
Moreton-in-Marsh |
Newent |
Newquay |
Newton Abbot |
Newtownards |
Okehampton |
Ottery Saint Mary |
Padstow |
Paignton |
Par |
Penryn |
Penzance |
Perranporth |
Pershore |
Pewsey |
Plymouth |
Radstock |
Redruth |
Ross-on-Wye |
Saint Agnes |
Saint Austell |
Saint Columb |
Saint Ives |
Salcombe |
Saltash |
Seaton |
Shepton Mallet |
Sidmouth |
Somerton |
South Brent |
South Molton |
South Petherton |
Stoke-sub-hamdon |
Stonehouse |
Street |
Stroud |
Swindon |
Taunton |
Tavistock |
Teignmouth |
Tetbury |
Tewkesbury |
Tiverton |
Torpoint |
Torquay |
Torrington |
Totnes |
Trowbridge |
Truro |
Umberleigh |
Wadebridge |
Warminster |
Watchet |
Wedmore |
Wellington |
Wells |
Westbury |
Weston-Super-Mare |
Wincanton |
Winkleigh |
Winscombe |
Worcester |
Wotton-under-Edge |
Yelverton |
Yeovil |
Counties
Herefordshire |
Wiltshire |
Cornwall |
Worcestershire |
Gloucestershire |
Devon |
Somerset |
The SW Distribution Zone is operated by Wales and West Utilities