| Description | Hawkhurst Gas; Hay Gas & Coke; Hayfield Gas; Hayle Gas; Haywards Heath District Gas; Heckington Gas; Hellifield & District Gas; Helmsley Lighting; Helston & District Gas; Hemsworth; Grimethorpe & District Gas; Henley-In-Arden Gas, Coal & Coke; Herne Bay Gas; Hessle Gas; Hexham Gas; Holderness Gas; Hollingworth Gas; Holyhead & North Wales Gas & Water Corporation; Honiton Gas & Coke; Horley District Gas; Hornsea Gas, Light & Coke |