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 WM area covers the following area.

Towns
Atherstone |
Bedworth |
Bewdley |
Bilston |
Birmingham |
Bishops Castle |
Bridgnorth |
Brierley Hill |
Bromsgrove |
Bromyard |
Broseley |
Burntwood |
Cannock |
Church Stretton |
Congleton |
Coventry |
Cradley Heath |
Craven Arms |
Droitwich |
Dudley |
Halesowen |
Henley-in-Arden |
Hinckley |
Kenilworth |
Kidderminster |
Kingswinford |
Kington |
Leamington Spa |
Leek |
Leominster |
Lichfield |
Ludlow |
Malvern |
Market Drayton |
Much Wenlock |
Newcastle-under-Lyme |
Newport |
Nuneaton |
Oldbury |
Redditch |
Rowley Regis |
Rugby |
Rugeley |
Shifnal |
Shipston-on-Stour |
Smethwick |
Solihull |
Southam |
Stafford |
Stoke-on-trent |
Stone |
Stourbridge |
Stourport-on-Severn |
Stratford-Upon-Avon |
Studley |
Sutton Coldfield |
Tamworth |
Telford |
Tenbury Wells |
Tipton |
Uttoxeter |
Walsall |
Warwick |
Wednesbury |
West Bromwich |
Willenhall |
Wolverhampton |
Counties
Cheshire |
West Midlands |
Leicestershire |
Herefordshire |
Warwickshire |
Shropshire |
Worcestershire |
Staffordshire |
The WM Distribution Zone is operated by Cadent