Mains natural gas in the UK is dosed with mercaptan, a sulphurous-smelling odorant that humans can detect at concentrations as low as 0.4 parts per million, well below the lower explosive limit (4–4.5%). If you can smell gas, the concentration is at minimum hundreds of times below the explosive level, but you should still treat it as an emergency and not delay action.
The standard sequence in any UK gas emergency: (1) leave the property and don't switch any electrical equipment; (2) call National Gas Emergency 0800 111 999, they will dispatch a free engineer who will isolate the meter and make the property safe; (3) call us, we'll be with you within 60 minutes to identify the leak source within the property and carry out the permanent repair under our Gas Safe registration.
Where this service applies
- Smell of gas in a domestic property
- Hissing sound from gas pipework or meter
- Suspected leak after recent gas work or pipe alteration
- Visible damage to gas pipework
- Gas leak following a property break-in or vandalism
- Tightness test failure on routine inspection
- Carbon monoxide alarm activation
- Yellow or orange flame on a gas appliance such as a gas fire
How we deliver
No surprises, no upselling. The exact path every job follows.
- 1
Customer evacuates property
We instruct evacuation if not already done. - 2
National Gas Emergency Service called
0800 111 999, they isolate at the meter (free, 24/7). - 3
Our Gas Safe engineer dispatched
60-minute response across London. - 4
Tightness test
BS 6891 standard pressure-decay test isolates the leak section. - 5
Sniffer probe survey
Hydrogen-detection probe pinpoints the leak source. - 6
Permanent repair
Pipework section replaced, joint remade, or appliance sealed. - 7
Post-repair tightness test
Verified leak-free before re-pressurising. - 8
Reinstatement & commissioning
Gas supply restored under controlled re-pressurisation. - 9
Written report & certificate
For insurance and Gas Safe records.