| Description | Desborough Gas; Devon Gas Association; Dolgelly Gas & Coal; Dollar Gas; Dorchester Gas & Coke; Dover Gas; Dowlais Gas & Coke; Dudley, Brierley Hill & District Gas; Dunblane Gas; Dunlop Gas Light; Dunmow Light & Heat; Dunning Gas; Duns Gas; Dunstable Gas & Water; Dursley Gas Light & Coke; Earby & Thornton Gas & Lighting; Earls Colne Gas Light & Coke |