If you suspect a gas leak do not delay !
Telephone National Grid Emergencies 0800 111 999 immediately
This is a 24 hour a day & 7 days a week service run by National Grid.
When you contact this number you will be asked for certain information including details of the property address or location. If you can provide the post code this will be very helpful. This information is needed to get the engineer to the right location.
For more details and advice visit the National Grid Web Site by clicking on this link