- Gas Safety Check Hadfield
- Gas Safety Check Halifax
- Gas Safety Check Harrogate
- Gas Safety Check Hartlepool
- Gas Safety Check Hatfield (South Yorkshire)
- Gas Safety Check Haworth
- Gas Safety Check Hebden Bridge
- Gas Safety Check Heckmondwike
- Gas Safety Check Hedon
- Gas Safety Check Hemingbrough
- Gas Safety Check Hemsworth
- Gas Safety Check Hessle
- Gas Safety Check Honley
- Gas Safety Check Horncastle
- Gas Safety Check Hornsea
- Gas Safety Check Horsforth
- Gas Safety Check Houghton-le-Spring
- Gas Safety Check Hoyland
- Gas Safety Check Hull